Some users have found success by opening the problematic PDF in macOS Preview and using Export as PDF . This can sometimes "bake in" the font data so it is readable in other programs.
When you see inside a PDF’s font list, those are just internal tags —placeholders. For example: cid font f1 f2 f3 f4 free link download
Because these are just system-generated labels, there is no "official" website to download them. Sites claiming to offer a "CID Font F1 Free Download" are often unreliable or may bundle malware. Some users have found success by opening the
"CID" stands for . In the world of PDFs, these names (F1, F2, etc.) are placeholders created by software when it cannot properly identify or embed the original font. these names (F1