These names typically appear in error messages when a PDF is opened in software like Adobe Acrobat, Illustrator, or Affinity Designer. This happens because the original fonts were subsetted or improperly embedded
If the F1-F6 labels map to different , then: Cidfont-f1 F2 F3 F4 F5 F6
If you have Acrobat Pro, you can force the document to fix itself: CIDFont+F1 issue - Adobe Community These names typically appear in error messages when
The codes you listed () are technical font identifiers usually seen when a PDF fails to load its fonts properly. For Roman alphabet languages, that is sufficient
Before 1990, standard Type 1 fonts (PostScript) could only handle 256 glyphs per font. For Roman alphabet languages, that is sufficient. However, Japanese (Kanji) requires over 6,000 common characters, while Chinese requires over 20,000.
The naming convention (Cidfont-f...) is a remnant of PostScript 3 architecture. When an Adobe PDF Distiller processes a document, it creates a font dictionary. To save space and processing power, it assigns short handles to these dictionaries: