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https://issues.apache.org/jira/browse/PDFBOX-5682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17764225#comment-17764225
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Tim Allison commented on PDFBOX-5682:
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Thank you, [~lehmi]. In Tika, we initially copied PDFBox's
ExtractEmbeddedFiles example, but we found that PDF writers can stuff attached
files/file specs/associated files on pretty much anything
(https://www.pdfa.org/wp-content/uploads/2018/10/PDF20_AN002-AF.pdf) .
>From what we can tell with publicly available corpora, it is rare to have an
>attachment not in the name tree and not in an annotation on a page, but after
>making the change in TIKA-4012, we did find a few new attachments.
This may be a "won't fix" in 3.x.
> Long/permanent hang in PDFBox 3.x
> ---------------------------------
>
> Key: PDFBOX-5682
> URL: https://issues.apache.org/jira/browse/PDFBOX-5682
> Project: PDFBox
> Issue Type: Bug
> Reporter: Tim Allison
> Priority: Minor
>
> I found two files in the regression tests where we're now getting timeouts at
> 3 minutes where we weren't before. Unfortunately, PDFBox's export:text works
> on both, so it is probably another structural feature, perhaps a problem in
> Tika?
> This file halts after printing out the header for Table 19 on page 46:
> https://corpora.tika.apache.org/base/docs/govdocs1/078/078656.pdf
> Pure PDFBox's export:text complains multiple times: "Page skipped due to an
> invalid or missing type null, but it does finish quickly."
> This file halts after extracting {{"854,793,592"}}:
> https://corpora.tika.apache.org/base/docs/commoncrawl3_refetched/G7/G7BO7PNCCREVF2BCY5YSYOPYDLMBYASY
> Pure PDFBox's export:text processes this without problem.
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