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https://issues.apache.org/jira/browse/PDFBOX-6288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18144810#comment-18144810
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Andreas Lehmkühler commented on PDFBOX-6288:
--------------------------------------------
The best way to fix such pdfs is to simply embed the font so that the
ToUnicode-cmap isn't needed at all for a hacky fallback mechanism and it won't
matter if it is well- or malformed at all.
> Invalid ToUnicode CMap
> ----------------------
>
> Key: PDFBOX-6288
> URL: https://issues.apache.org/jira/browse/PDFBOX-6288
> Project: PDFBox
> Issue Type: Bug
> Reporter: Oliver Schmidtmer
> Priority: Major
> Attachments: MalformedToUnicodeCMap.pdf,
> image-2026-11-12-12-51-25-119.png, image-2026-11-12-12-53-07-456.png,
> image-2026-11-12-12-55-54-029.png, toUnicode-CMAP.patch
>
>
> A problematic PDF file contains a "ToUnicode CMap" that uses "begincidrange"
> instead of "beginbfchar" or "beginbfrange".
> Since the CMap is ignored in this case, the wrong glyphs are used during
> rendering. Because the file displays correctly in Acrobat, a workaround might
> be justified.
> The attached PDF file is a generated example, as the original contains
> sensitive data. I used Copilot for the analysis and to create a potential
> patch:
> https://github.com/Schmidor/pdfbox/commit/425e83caaa28c66e6e4438c7818f0eb0a448fae9
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