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https://issues.apache.org/jira/browse/PDFBOX-4393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16708601#comment-16708601
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Tilman Hausherr commented on PDFBOX-4393:
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If I sign the original file twice with Adobe Reader then it works. Maybe
because the first signature adds the metadata...
IMHO it is an Adobe bug. Are you an Adobe client so that you have access to
support?
> 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
> Environment: Windows
> Reporter: Martin Klíma
> Priority: Major
> 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_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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