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https://issues.apache.org/jira/browse/PDFBOX-4393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16716401#comment-16716401
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Tilman Hausherr commented on PDFBOX-4393:
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I've also submitted a bug report to Adobe last Friday and a person responded
today that "We have logged a bug" and that they will "get back with an update
as soon as possible". This sounds promising.
> PDF signature invalid after second interactive field signed
> -----------------------------------------------------------
>
> Key: PDFBOX-4393
> URL: https://issues.apache.org/jira/browse/PDFBOX-4393
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.12, 2.0.13
> Environment: Windows
> Reporter: Martin Klíma
> Priority: Major
> Fix For: 2.0.14, 3.0.0 PDFBox
>
> Attachments: image-2018-12-04-11-14-01-586.png,
> image-2018-12-04-11-14-32-676.png, streamserve_test_sig0.pdf,
> streamserve_test_sig0_saved.pdf, streamserve_test_sig0_saved_signed by
> PDFBox.pdf, streamserve_test_sig0_saved_signed by PDFBox_then_signed by
> AR.pdf, streamserve_test_sig0_signed by PDFBoxNEW.pdf,
> streamserve_test_sig0_signed by PDFBoxNEW_signed by AR.pdf,
> streamserve_test_sig2.pdf, streamserve_test_sig3.pdf,
> streamserve_test_sig3.signed.pdf
>
>
> Hi guys,
> I stumped on the problem with PDFBox and interactive field signing. I have
> PDF generated with OpenText StreamServe with two interactive fields for
> signing. See example 1 (streamserve_test_sig0.pdf) in attachement.
> When I use Adobe Reader I can sign both of the visual fields just fine but
> when I use PDFBox to sign one of this field the following signature is marked
> as invalid. Doesn't matter if I use PDFbox or sign it manually with Adobe
> Reader See example 3:
> * streamserve_test_sig3.pdf (signed by PDFBox) - valid
> * streamserve_test_sig3.signed.pdf (signed 2nd by Adobe Reader) - invalid
> !image-2018-12-04-11-14-01-586.png|width=582,height=269!
>
> Also last example - when it´s signed first by Adobe Reader and then with
> PDFBox the signature seems valid but it says the document was "certified".
> See example 2 (streamserve_test_sig2.pdf)
> !image-2018-12-04-11-14-32-676.png|width=591,height=283!
>
> What could be wrong? When is signed whole document with PDFBox it works just
> fine.
> Thanks for response,
> Martin
>
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