(Character Identifier) fonts are a font format used in PostScript and PDF files, commonly for East Asian languages (Chinese, Japanese, Korean – CJK). The labels F1, F2, F3, F4, F5, F6, F7 often refer to font registry keys or printer-resident CID fonts in older Adobe PostScript printers or software (e.g., Adobe Acrobat, Illustrator).
There are free, open-source alternatives that utilize CID technology for CJK support. These are legal and free to download: CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
The names do not refer to a specific "free font" available for download. Instead, they are generic placeholders created by PDF exporting software when it fails to properly embed the original fonts. (Character Identifier) fonts are a font format used
The font CIDFont+F1 is Arial (blod) and CIDFont+F2 is Arial (Regular) These are legal and free to download: The
Since you cannot download an "F1" font, you need to identify what the original font was. Here is how to do it: Open your PDF in Adobe Acrobat Reader .