In the context of PostScript printing and PDF processing, "F1," "F2," and "F3" are or aliases. They are not the actual names of the fonts.
Be cautious of websites claiming to offer "Cid Font F1 Free Download". Because these names are generic placeholders, any file you download with that name is likely a random font or potentially malicious software, as there is no single "official" version of an F1 placeholder font. Impossible fonts to be found / Fontes impossÃveis de achar Cid Font F1 F2 F3 Download -
If you are trying to open a file that says these fonts are missing, downloading a "CIDFont" file will rarely work because the label is unique to that specific document. Instead, try these solutions: In the context of PostScript printing and PDF