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https://issues.apache.org/jira/browse/PDFBOX-2661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14308287#comment-14308287
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John Hewson commented on PDFBOX-2661:
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The font in your rendering is Arial, which is Acrobat's usual substitution for
Helvetica on platforms which don't have a native Helvetica font.
{quote}
Another weird thing is that if I leave the field in Reader the text goes away
for "Foobar" and "FranklinGothic-MediumItalic" but not "MinionPro-Bold" or
"Helvetica-BoldOblique".
{quote}
I noticed this too, it might be an Acrobat bug.
{quote}
I think Adobe Readers knowledge about these fonts are table based...
{quote}
It's possible, but we haven't seen any evidence yet that shows Acrobat doing
anything beyond looking at the words "Medium" and "Italic" at the end of font
names, which is a substitution mechanism which we already support in
ExternalFonts.
{quote}
If you dump the AcroForm.api plug-in binary you'll find that it contains the
names of hundreds of fonts
{quote}
That's interesting though there may be other purposes for that least. We need
to have a PDF which shows fonts with the same name endings e.g. -MediumItalic
being mapped to different fonts to show that this is actually the case. Can you
attach a text file with the list of fonts which you extracted from AcroForm.api?
> 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, Fonts2-Filled.pdf, Fonts2.pdf,
> Franklin.png, field-filled.png, field.png, fonts2-filled.png
>
>
> 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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