The labels , etc., are typically internal aliases assigned by the PDF generator. While these aren't the actual names of the fonts you need to download, they often correspond to common font families used in the original document:
: Opening the problematic file in a viewer like macOS Preview and using the "Export as PDF" function can sometimes "flatten" the encoding and make the file usable in other software. CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
is a method of encoding font data to support large and complex character sets, such as those used in Asian languages or extensive Unicode collections. When software generates a PDF, it may convert a standard font (like OpenType ) into CID encoding to embed it into the file. Decoding the F1 to F7 Labels The labels , etc