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Is there any solution to know the similarity of the two pdfs without comparing the contents

I want to know the similarity of pdf files, but I do not want to compare the content. is there any solution only from its external structure. Is it possible? thanks!

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It sounds potentially tough, but here are some low-power rewards from PDF metadata in order of complexity.

  • Document metadata such as eBook-titleandTitle
  • Number of pages in a document (counting /Pagedirectives)
  • Compare the metadata for each page, such as MediaBox, CropBox, BleedBox,TrimBox
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PDF is not just a text file. Its binary dump is a B-tree. Using compressed objects, you can also get object data compressed inside other binary objects so that they are not visible.

If you want to perform low-level text manipulation, you really need to use a decent tool. Acrobat 9.0 has a menu item for viewing the internal structure of a PDF, or you can use something like IText.

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Source: https://habr.com/ru/post/1705545/

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