automatically assigned by software (like Adobe Acrobat or Nitro Pro) when a PDF fails to properly embed or identify an original font. Google Groups Critical Technical Overview
Extensive TrueType and PostScript hinting strategies have been applied. The F1 Family renders crisply on low‑resolution displays (e.g., 96–120 DPI) and scales gracefully for high‑DPI screens and print. cid font f1 family
To find out exactly which font family F1 corresponds to in your specific case: automatically assigned by software (like Adobe Acrobat or
CID Font F1 family is not a specific typeface you can go out and buy; rather, it is generic internal placeholder used by PDF software when a font is embedded using Character Identifier (CID) cid font f1 family