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https://issues.apache.org/jira/browse/PDFBOX-3645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15826396#comment-15826396
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G. Ralph Kuntz commented on PDFBOX-3645:
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It was an observation.
> Probably not handling header read on bad PDFs
> ---------------------------------------------
>
> Key: PDFBOX-3645
> URL: https://issues.apache.org/jira/browse/PDFBOX-3645
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 2.0.4
> Reporter: G. Ralph Kuntz
> Priority: Minor
>
> In COSParser.parseHeader, the code on line 1893 tries to handle PDFs where
> the version number is split on a separate line from the "%PDF-". It assigns
> the newly read line to `header`, detects a line that starts with a digit,
> then breaks.
> On line 1902, the code tries again to match the header "%PDF-xxx", but will
> not succeed in the case where the version was on a separate line, because
> `header` will contain only the version number and not the leading `%PDF-`.
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