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Sam Alloing edited this page May 27, 2020 · 13 revisions

PDF-HUL-1

Message

Invalid destination object

Details

An unexpected object type was found for a destination object. A destination object is expected to be an array containing a page reference, a dictionary containing such an array, or a name object leading to either of these objects.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-2

Message

Invalid destination object

Details

An unexpected object type was returned when resolving a destination's page reference to a page. In this case the orignal destination object was an array or dictionary that resolved to an array but didn't. A destination object is expected to be an array containing a page reference, a dictionary containing such an array, or a name object leading to either of these objects.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-3

Message

An IOException was thrown reading destination array id: <array object id>

Details

An IOException occured when trying to read and parse the destination array object, this indicates either a discrete issue with the destination array or a more serious issue with the PDF structure that makes looking up and retrieving the destination array impossible.It's possible a system issue, particularly low disk space, could cause the exception.

  • Type: PdfInvalidException
  • Source location: Needs review
  • Examples: Needed

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-4

Message

Missing dictionary in document node

Details

A page or page tree node is not a dictionary. All pages and page trees should be a dictionary, which provides access to their resources and other attributes.

References

Impact

The page or any pages descending from the page tree will be inaccessible and may not appear in a reader.

Remediation

Is it possible to build a page's dictionary after the fact? Maybe iText can fix it. We (at ZBW) have an iText-Tool, which just copies each page into a new PDF. The PDF structure gets repaired by this procedure and I would guess that it would build a brand new PDF Dictionary for the PDF. I do not have any example on hand, though, so I cannot check.

PDF-HUL-5

Message

Invalid Resources Entry in document

Details

One of the objects processed when resolving the Resources dictionary was of a type not allowed by the PDF Specification, or there was an IO error when resolving the Resources dictionary. Page Tree Nodes may have an empty resource dictionary (no resources) or no entry, meaning the resources are inherited from a parent node.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-6

Message

Invalid Font entry in Resources

Details

An IOException occurred when reading the reference for the for Fonts dictionary found in the Resource catalog for the Page Tree Node. Resource catalogs don't need to have a Font's dictionary but this error indicates the catalogue provides a reference to one that can't be read.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-7

Message

Malformed MediaBox in page tree

Details

A page dictionary's "MediaBox" key value is not an array.

  • Type: PdfInvalidException
  • Source location: Needs review
  • Examples: Needed

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-8

Message

Malformed MediaBox in page tree

Details

A page's "MediaBox" entry is not an array of four numbers. "MediaBox" entries must contain an array of four numbers marking the X and Y coordinates for the lower-left and upper-right corners of a rectangle, e.g. [2 2 5 5].

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-9

Message

Invalid file specification

Details

A file specification is processed as a dictionary that can have one of the key values 'F', 'Unix', 'DOS', or 'Mac'. The value of these keys should be a simple object with the file specification as a String value. In this case the object returned wasn't a simple object with a String value.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-10

Message

Unterminated literal in PDF file

Details

No closing parenthesis was found when processing a String literal. All String literals must be enclosed in parenthesis.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-11

Message

Invalid character in hex string

Details

An invalid character was found in a hexadecimal string.A hexadecimal string is written as a sequence of hexadecimal digits (0 – 9 and either A – F or a – f) enclosed within angle brackets (< and >). The hex string in question contains a character outside this set.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-12

Message

Invalid name tree

Details

An unexpected object type was encountered when processing a name tree node. A name tree node is a dictionary that depending on its type: root, intermediate or leaf; can have up to two entries with keys "Names", "Kids", or "Limits", each of which is should have an array value. In this case either the returned value for an entry was not a PDF array, or the elements of the Limits entry array weren't Strings as per the specification.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-13

Message

Invalid name tree

Details

The name tree node has a "Limits" dictionary entry that returned either a null entry or the entry returned was a PDF array that didn't have element at positions [0] and [1].

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-14

Message

Invalid name tree

Details

There was an I/O error resolving the object for one of the entries, "Names", "Kids", or "Limits" in the name tree node.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-15

Message

Invalid name tree

Details

The name tree node dictionary does not have one of a "Names" or "Kids" entry as per the PDF specification.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-16

Message

Invalid name tree

Details

An unexpected error occured while parsing a name tree node. This might have been a wrong object type, missing object, or null object encountered while processing the entries, or an I/O error resolving them.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-17

Message

Offset out of bounds in object stream

Details

An I/O error occurred when processing an object stream, this might have been when finding the object start or reading the object.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-18

Message

Missing expected element in page number dictionary

Details

The "Nums" entry of a page label leaf node is missing. JHOVE seems to have munged the PDF concepts of a page label and a number tree, this needs review.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-19

Message

Invalid date in page number tree

Details

An unexpected error occurred while retrieving key–value pairs from a page label node's "Nums" entry. Doesn't appear to have anything to do with dates. Needs review. Can confirm that JHOVE 1.12 gave the same message and it's nothing to do with dates.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-20

Message

Invalid page label node

Details

An unexpected error occured when processing the page lable number tree.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-21

Message

Invalid Annotations

Details

A page objects annotations entry ("Annots") is not an Array.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-22

Message

Invalid Annotations

Details

An IOException was encountered while trying to retrieve a page object's annotation array.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-23

Message

Malformed ArtBox in page tree

Details

A page object's dictionary has an "ArtBox" entry but it is not an array describing a rectangle.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-24

Message

Malformed TrimBox in page tree

Details

A page object's dictionary has a TrimBox entry but it is not an array describing a rectangle.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-25

Message

Malformed BleedBox in page tree

Details

A page object's dictionary has a "BleedBox" entry but it is not an array describing a rectangle.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-26

Message

Invalid dictionary data for page

Details

An I/O error occured when resolving a page object dictionary's contents entry, or parsing its contents.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-27

Message

Invalid dictionary data for page

Details

The value retrieved for a page object's "Contents" key is not a content stream or an array.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-28

Message

Invalid dictionary data for page

Details

A page objects's "Contents" key value is an array, but one of the elements is now a stream as per the specification.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-29

Message

Invalid page tree node

Details

A general exception was caught when processing a page tree. Page tree node must include the entries "Type", "Parent", "Kids", and "Count" to be valid.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-30

Message

Improperly constructed page tree

Details

Thrown if, when trying to get the next Page Object in a tree, we revisit a node we've already been to (circular page tree construction?). It is mandatory to save PDF pages in a page tree, but the specification does not say that this page tree necesarily needs to be balanced. Suggestion during the OPF PDF Hackathon in 2014 was to ignore this error message. Having pages in a un-balanced page tree only has a negative effect on rendering performance, but does not lead to PDF invalidity.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-31

Message

Improperly constructed page tree

Details

Thrown if, when trying to get the next node in a page tree, we revisit a node we've already been to (circular page tree construction?). It is mandatory to save PDF pages in a page tree, but the specification does not say that this page tree necesarily needs to be balanced. Suggestion during the OPF PDF Hackathon in 2014 was to ignore this error message. Having pages in a un-balanced page tree only has a negative effect on rendering performance, but does not lead to PDF invalidity.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-32

Message

Excessive depth or infinite recursion in page tree structure

Details

The page tree structure was too deep, JHOVE sets an arbitary limit of 100 here presumably to guard against infinite recursion.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-33

Message

Improperly nested dictionary delimiters

Details

More dictionary closing elements (">>") were encountered than dictionary opening elements ("<<").

  • Type: PdfMalformedException
  • Source location: Parser.java L100
  • Examples: Needed

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-34

Message

Improperly nested array delimiters

Details

More array closing elements ("]") were encountered than array opening elements ("[").

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-35

Message

Invalid object definition

Details

A non numeric object ID was returned when parsing the indirect object definition. The first token must be an integer object ID.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-36

Message

Invalid object definition

Details

PDF Parser's next token (from getToken) is not a Numeric (class) Token, This is the object generation number and must be an integer. Cause in example file is missing byte in comment line after header which means that offset references in XREF are off by 1 affecting position of tokenizer. Parser.readObjectDef first reads ObjNumTok. If this object number is a double digit, the off by 1 error (in this example) only reads the tail portion of the object number (i.e. it still gets a numeric obj number, even though it's wrong). Problem occurs in this case when obj number is single digit, so no object number is read.

References

Impact

Example file is still renderable in Adobe Acrobat Pro

Remediation

Correct XREF offsets.

PDF-HUL-37

Message

Invalid object definition

Details

PDF Parser's next token (from getToken) is not a keyword, the keyword "obj" is expected after the object id.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-38

Message

Invalid object definition

Details

A keyword other than "obj" was found while parsing an indirect object definition. Indirect object definitions should follow the form "<obj. number> <obj. generation> obj".

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-39

Message

Cannot parse object

Details

The token returned when parsing an object was not of the expected type: Array start or end, Dictionary start or end, or a simple token.

  • Type: PdfMalformedException
  • Source location: Parser.java L297
  • Examples: Needed

References

  • PDF 1.6: Needs review
  • PDF 1.7: Needs review

Impact

Needs review

Remediation

Needs review

PDF-HUL-40

Message

Unexpected token in array

Details

This appears to be an unreachable error. Needs review. I concur, the type check has already taken place.

  • Type: PdfMalformedException
  • Source location: Parser.java L327
  • Examples: Needed

References

  • PDF 1.6: Needs review
  • PDF 1.7: Needs review

Impact

Needs review

Remediation

Needs review

PDF-HUL-41

Message

Malformed dictionary: Vector must contain an even number of objects, but has ...

Details

The dictionary has an odd number of objects, so cannot have a complete set of name–value pairs. Often seen with asian characters in PDF, characters in bookmarks.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-42

Message

Malformed dictionary

Details

Unexpected error while parsing a dictionary. This is most likely caused by a null (missing) object or an object of an unexpected type when processing the dictionary.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-43

Message

Unexpected token in dictionary

Details

This appears to be an unreachable error. Needs review. Similar case to PDF-HUL-40 where the type check that might throw this has already been performed.

  • Type: PdfMalformedException
  • Source location: Parser.java L385
  • Examples: Needed

References

  • PDF 1.6: Needs review
  • PDF 1.7: Needs review

Impact

Needs review

Remediation

Needs review

PDF-HUL-44

Message

Malformed indirect object reference

Details

A general exception was thrown while trying to "collapse an object vector" (JHOVE speak), the most likely cause is that a missing (null) object or an object of an unexpected type was encountered while processing an object "vector".

  • Type: PdfMalformedException
  • Source location: Parser.java L452
  • Examples: Needed

References

  • PDF 1.6: Needs review
  • PDF 1.7: Needs review

Impact

Needs review

Remediation

Needs review

PDF-HUL-45

Message

Malformed filter

Details

This indicates an issue with a stream dictionary's "Filter" (or deprecated "FFilter") entry or the associated "DecodeParms" (or deprecated "FDecodeParms") entry. The "Filter" entry can be a single name or an array of names. The "DecodeParms" entry is either a single parameter dictionary accompanying a single "Filter" name, or an array of dictionaries accompanying an array of "Filter" names. Xerox Example error is based on image filters ZIP & JPEG on same image

References

Impact

Needs review

Remediation

Change embedded image compression filter

PDF-HUL-46

Message

Malformed ASCII number in stream

Details

An integer object in a stream contained an invalid character. The integer must be a sequence of numberic characters that may be preceded by whitespace characters. In this case a non-whitespace character was encountered before any numeric character was encountered.

  • Type: PdfMalformedException
  • Source location: Stream.java L202
  • Examples: Needed

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-47

Message

Streams may not be embedded in object streams

Details

This is triggered when the a "stream" object is found within another stream object.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-48

Message

Streams may not be embedded in object streams

Details

This is triggered when the a "stream" object is found within another stream object.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-49

Message

Unknown element in structure tree

Details

The "K" (children) entry of a structure element dictionary was another dictionary. This dictionary must be one of: another nested strucuture element, marked content or an object reference, the returned dictionary was none of these.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-50

Message

Invalid structure attribute reference

Details

There was an issue resolving the "A" attributes entry of a structure element dictionary.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-51

Message

Invalid structure attribute

Details

There was an I/O error resolving one of the elements of an attributes array.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-52

Message

Invalid structure attribute

Details

An attribute element that was a PdfSimpleObject wasn't a numeric revision number.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-53

Message

Invalid structure attribute

Details

An element from an attributes array wasn't a dictionary or revision number object.

  • Type: PdfInvalidException
  • Source location: Needs review
  • Examples: Needed

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-54

Message

Structure attribute has illegal type

Details

The value of a structure element dictionary's "A" (attributes) entry wasn't a single attributes dictionary or an array (of attribute dictionaries).

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-55

Message

Block-level attributes in inline structure element

Details

Attributes only applicable to a block-level structure element were found for an inline structure element.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-56

Message

Invalid attribute in document structure

Details

An attribute dictionary's "Placement" value was not a name.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-57

Message

Non-standard structure type name

Details

This checks that the structure element's structure type key ("S") value is one of the Adobe standard types. The check is currently disabled in code, and it should. The Adobe types are provided to aid interoperability between applications, but custom types are allowed. Review and remove permanently. A more sensible check would be that it was a name that confirmed to the naming standard in the PDF spec, Appendix E in the 1.6 version.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-58

Message

Invalid data in document structure tree

Details

An I/O exception was thrown when trying to resolve a structure elements children ("K") value.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-59

Message

Invalid document structure root

Details

A structure tree root's "Type" name value that wasn't "StructTreeRoot". The structure tree root dictionary must have a Type key whose value is the name "StructTreeRoot".

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-60

Message

Invalid document structure root

Details

The structure tree root dictionary had no key "Type" or the value was of the wrong type.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-61

Message

Invalid data in document structure root

Details

An I/O exception was thrown when trying to resolve a reference in a structure trees children.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-62

Message

Invalid data in document structure root

Details

The structre tree's "K" value was not a dictionary or an array. A structure tree root's children ("K") value must be a single child dictionary, or an array of such dictionaries.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-63

Message

Invalid RoleMap

Details

If a structure tree root dictionary has a "RoleMap" value it must be a dictionary.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-64

Message

Unexpected EOF

Details

Unsure if this can be triggered, seems to be a test against reading a character integer value < 0. I suspect that the real EOF handling will be triggered as a real Java EOFException. Needs reveiw

References

  • PDF 1.6: Needs review
  • PDF 1.7: Needs review

Impact

Needs review

Remediation

Needs review

PDF-HUL-65

Message

Lexical error

Details

An invalid character was encountered when parsing the fractional part of a real numeric object.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-66

Message

Lexical error

Details

A dictionary is written as a sequence of key-value pairs enclosed in double angle brackets ( << ... >>). In this case JHOVE is expecting to parse a dictionary end ">>" but only a single ">" was found.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-67

Message

Invalid character in hex string

Details

An invalid character was found in a hexadecimal string.A hexadecimal string is written as a sequence of hexadecimal digits (0 – 9 and either A – F or a – f) enclosed within angle brackets (< and >). The hex string in question contains a character outside this set.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-68

Message

Invalid cross-reference table

Details

An invalid first object id in a cross reference table. The first line of a "xref" cross reference trailer must be two numeric literals, separated by a space. The first is the id of the first object in the table. This must be a numeric type and it's not. This means the parsing of the trailer fails and this leads to a problem when parsing the rest of the document. With this error also PDF-HUL-85 is associated because the document root isn't found.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-69

Message

Invalid cross-reference table

Details

An invalid object count in a cross reference table. The first line of a "xref" cross reference trailer must be two numeric literals, separated by a space. The second is the number of objects in the table. This must be a numeric type and it's not.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-70

Message

Root entry missing in cross-ref stream dictionary

Details

A cross reference streams dictionary doesn't contain the root entry required by a trailer dictionary.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-71

Message

No file trailer

Details

The "trailer" keyword that marks the start of the document trailer wasn't found.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-72

Message

Invalid Prev offset in trailer dictionary

Details

The "Prev" entry of a trailer dictionary does not reference a numeric value. Trailer "Prev" entries should specify the byte offset of the previous cross-reference section in a PDF with multiple cross-reference sections.

References

Impact

Needs review

Remediation

If there is only one cross-reference section in a PDF, the "Prev" entry should be removed.

PDF-HUL-73

Message

Invalid Size entry in trailer dictionary

Details

The "Size" entry of a trailer dictionary does not contain a positive numeric value. Trailer "Size" entries should specify the total number of objects in a PDF's cross-reference table.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-74

Message

Size entry missing in trailer dictionary

Details

Trailer has no "Size" value. Trailer "Size" entries are required to specify the total number of objects in a PDF's cross-reference table.

References

Impact

Needs review

Remediation

Needs review

PDF-HUL-75

Message

Root entry missing in trailer dictionary

Details

The "Root" entry in the trailer is missing. The "Root" entry should have as its value the document's catalog dictionary, which is where you will start in order to find all the objects in the PDF. See also PDF-HUL-85.

References

Impact

Needs review

Remediation

Needs review

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