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https://issues.apache.org/jira/browse/PDFBOX-2661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14305037#comment-14305037
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Christer Palm commented on PDFBOX-2661:
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This is what seems to be going on with Adobe Reader/Acrobat when Tf is used to
set the font within the DA of a form field:
1. The Tf can refer to any of the standard fonts by name without the need for
this name to be defined in the documents font resource
For example: DA = "/ZapfDingbats 11 Tf 0 g"
2. The Tf can also refer to the standard fonts using a shorthand alias names:
Cour -> Courier
CoOb -> Courier-Oblique
CoBo -> Courier-Bold
CoBO -> Courier-BoldOblique
Helv -> Helvetica
HeOb -> Helvetica-Oblique
HeBo -> HelveticaBold
HeBO -> HelveticaBoldOblique
TiRo -> Times-Roman
TiIt -> Times-Italic
TiBo -> Times-Bold
TiBI -> Times-BoldItalic
Symb -> Symbol
ZaDb -> ZapfDingbats
Optional fonts (mapping not confirmed):
KaGo -> KanjiGothic
KaMi -> KanjiMincho
MHei -> MHei-Medium
MSun -> MSung
STSo -> STSong
HySm -> HYSMyeongJo
HyGo -> HYGoThic
Optional fonts without shorthand aliases:
HeiseiKakuGo-W5
HeiseiMin-W3
MHeiMed -> MHei-Medium
MSung-Light
STSong-Light
HYSMyeongJo-Medium
HYGoThic-Medium
For example: DA = "/ZaDb 11 Tf 0 g"
3. On top of that, there seems to be a large number of other non-standard fonts
that the Tf can refer to by name
4. If Adobe Reader doesn't find a match it will fall back to Helvetica
Note that, except for #4, this only applies when the Tf is within a form field
DA.
> 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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