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https://issues.apache.org/jira/browse/PDFBOX-6249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18110300#comment-18110300
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Tilman Hausherr commented on PDFBOX-6249:
-----------------------------------------
After doing the change in FontMapperImpl there is one file,
PDFBOX-6175-WWNU7HS7FIUK3TT2DGHTZ2T4MYPCTNYJ-p1-reduced.pdf, which succeeds
with the change in PDCIDFontType0.java. After the change I get the same log
message as you do. However "NotoSerifCJKjp" shouldn't be, because with the
changes I did a CJKjp font wouldn't match. The ttc file has a weirdness that is
also shown with OTM Light: each font in the collection points to the same
NotoSansCJKjp-Regular CFF header, maybe that is what goes wrong.
> Non-embedded Adobe-GB1/CNS1/Japan1 fonts render as .notdef even when Noto CJK
> / Source Han fonts are installed
> --------------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-6249
> URL: https://issues.apache.org/jira/browse/PDFBOX-6249
> Project: PDFBox
> Issue Type: Task
> Components: Rendering
> Reporter: Tim Allison
> Priority: Minor
> Attachments: cjk-cid-repro.pdf, image-2026-08-31-18-22-38-997.png,
> image-2026-08-31-20-35-16-505.png
>
>
> I ran a rendering bake-off with pdftoppm vs PDFBox on the 1k pdfs in [digital
> corpora
> 0000.zip|https://digitalcorpora.s3.amazonaws.com/corpora/files/CC-MAIN-2021-31-PDF-UNTRUNCATED/zipfiles/0000-0999/0000.zip]
>
> There was a small handful of files where pdftoppm and pdfium were handling
> missing cjk fonts a bit better than PDFBox.
>
> Specifically:
> ||file||non-embedded CID font||collection||
> |0000000.pdf|MSungStd-Light-Acro|Adobe-CNS1|
> |0000063.pdf|STSongStd-Light-Acro|Adobe-GB1|
> |0000750.pdf|MSungStd-Light-Acro|Adobe-CNS1|
> |0000877.pdf|KozGoPro-Medium-Acro|Adobe-Japan1|
> |0000908.pdf|MSungStd-Light-Acro|Adobe-CNS1|
>
> I had Claude generate a small repro file (attached).
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