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Acrobat for Windows and Mac: Security & Digital signatures

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BUG: Acrobat DC misreported Invalid Signature

I have encountered several cases of PDF documents in the past few years. When I signed the first signature, Acrobat DC verified the signature correctly, but when I added the second signature (even though the second signature was signed with Acrobat DC) , Acrobat DC will report that the previous signature is invalid, but I didn’t actually make any changes. Other PDF software (Acrobat 9.0 Pro/iText/Foxit) can verify these signatures correctly. I don't understand what causes the Acrobat DC verification to fail?

In addition, I also encountered a "1 miscellaneous change(s)" problem in Case1.pdf

Use the latest Windows 10 and Acrobat Pro DC v2021.007.20091 to reproduce this problem, and Acrobat Reader DC can also reproduce the problem.

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xybei shared this idea  ·   ·  Report…  ·  Admin →
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  • mkl commented  ·   ·  Report

    I just had a look at Case1.pdf. Together with the third signature a number of (unnecessary!) changes were applied to page dimensions and page resources. This breaks earlier signatures.
    Case2.pdf ... Case5.pdf are different, here there are errors in the internal PDF structure of the respective first revisions. When loading the documents, Acrobat repairs this which breaks signatures.