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VS_Novice
Participating Frequently
Mar 1, 2021 9:44 PM UTC
Question

Need to parse the pdf to get all object from meta-data.

I need to parse the meta-data of a given PDF file to get counters of different types of objects contained in a pdf and extract the various object. Say object of type "/JavaScript" or "/ObjStm".

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7 replies

Test Screen Name
Legend
Mar 2, 2021 8:23 AM UTC

The Cos layer is what you get. It can enumerate all actual objects. If this isn't enough for you, Adobe don't have anything else, but there are many PDF libraries out there.

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    VS_NoviceAuthor
    Participating Frequently
    Mar 2, 2021 2:35 PM UTC

    Thanks!
    Wanted to check is there anything other than the COS layer that can help( I may not aware of it).
    Or if   Acrobat SDK has some added functionality for this as compared to PDFL SDK.

    I tried using open source libs, those are good but give some internal logic/ number error for a few malicious pdfs. So thought this is the most reliable one to go with.

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    Test Screen Name
    Legend
    Mar 1, 2021 11:13 PM UTC

    The Cos API gives access to all objects. But not to objstm. 

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      VS_NoviceAuthor
      Participating Frequently
      Mar 2, 2021 7:53 AM UTC

      Yeah, that's one of the cases.  And I need to maintain a counter of all kinds of objects even "/JS"  and all "/AA". So I need some sort of parser or enumerator.

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      try67
      Community Expert
      try67Community Expert
      Community Expert
      Mar 1, 2021 10:13 PM UTC

      This type of objects are not a part of a file's metadata, but the actual data...

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        VS_NoviceAuthor
        Participating Frequently
        Mar 1, 2021 10:58 PM UTC

        Yeah, true they should be called structural data of PDF.
        What I am trying to do is to extract all the structural objects, based on their type, and categorize those, Basically maintaining a counter of objects in each category.

        But couldn't find the right set of APIs or not even sure does the SDK enables us with any such kind of functionality.

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        VS_NoviceAuthor
        Participating Frequently
        Mar 1, 2021 9:47 PM UTC

        I am trying to do with PDF Library SDK for C++.


        Any leads would be really helpful.


        Thanks in advance!

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