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https://issues.apache.org/jira/browse/PDFBOX-2661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14305876#comment-14305876
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John Hewson commented on PDFBOX-2661:
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Actually that isn't what's actually going on, there's no unspecified fallback
mechanism at work. The PDF page content stream contains the labels for the form
fields, and the fields themselves are contained in individual appearance
streams.
The font fields each use custom fonts, as specified in their appearance
streams. The fonts are named Cour, CoOb, Helv, etc. and are present in the
appearance stream's resources, under those names. This is normal and expected
and correct.
However, the labels in the page content stream attempt to use those same font
names of Cour, CoOb, Helv, etc. but they are only defined in the individual
form field resources, not in the page resources, and so the lookup fails. This
is the fault of the PDF file itself. Indeed, if you look at the rendering in
Acrobat you'll see that the labels don't appear with custom fonts, they all
render as Helvetica. That's because Acrobat isn't doing any special font
substitution, it's just falling back to its default font.
> Implement font fallback for AcroForms
> -------------------------------------
>
> Key: PDFBOX-2661
> URL: https://issues.apache.org/jira/browse/PDFBOX-2661
> Project: PDFBox
> Issue Type: Improvement
> Components: AcroForm
> Affects Versions: 1.8.8, 2.0.0
> Reporter: Maruan Sahyoun
> Fix For: 2.1.0
>
> Attachments: FontTest.java, Fonts.pdf
>
>
> There are forms where the font specified in the fields default appearance is
> not pointing to the correct fields or forms resources entry. Adobe
> Reader/Acrobat have a (unspecified) fallback mechanism to resolve such
> missing fonts.
> We should be ably to come up with a similar solution.
> A sample of such an issue can be found in PDFBOX-1234
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