Always embed your CJK fonts fully. Never rely on the F1 fallback. For designers: If your PDF uses F1 Family, re-embed the original fonts before commercial printing. For archivists: The F1 Family is a warning sign. Your metadata is already degrading.
Create a custom cidfmap file for Ghostscript: cid font f1 family
If you're stuck with a file that won't display or edit correctly, try these quick workarounds: Cidfont+f1 Font Free - Google Groups Always embed your CJK fonts fully
Here is the truth: It’s a placeholder created when a PDF is exported incorrectly or when the original font wasn't properly embedded. What exactly is a CID Font? cid font f1 family