Embedded Font Support and ICEPdf
From Embedded Font Support and ICEPdf
ICEpdf Open Source
ICEpdf Open Source uses java.awt.Font when reading system font files for substitution. ICEpdf Open Source, by default, disables using java.awt.Font for reading embedded font files, because a malformed font file can crash the JVM. The system property
org.icepdf.core.awtFontLoading=true
can be set to enable java.awt.Font embedded font loading.
This will not work if the font embedded in the PDF is only a subset. It took far too long to figure this out.