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https://issues.apache.org/jira/browse/PDFBOX-2269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14094339#comment-14094339
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Tilman Hausherr commented on PDFBOX-2269:
-----------------------------------------
I committed a slightly modified version of your patch. Please test with your
own files, and look also in the source code whether I missed something in the
patch, because I temporarly reverted some of it. I also added a warning log
message for the crypto problem I had.
> Support for AES-256 Rev. 5 Decryption (Acrobat 9)
> -------------------------------------------------
>
> Key: PDFBOX-2269
> URL: https://issues.apache.org/jira/browse/PDFBOX-2269
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 2.0.0
> Reporter: Michele Balistreri
> Attachments: AES-256_Rev5.diff, pass17_decrypted.pdf
>
>
> This patch adds support for decrypting files using the (deprecated) AES-256
> scheme revision 5. The current version only support revision 6. Since
> revision 5 files are generated by Acrobat 9, there is a relatively large
> amount of them in the wild so support is needed.
> This patch includes also the fixes from PDFBOX-2268
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