When a PDF reader displays or "Identity-H (CIDFont+F1)" in its document properties, it indicates that the file generator used a CID-keyed architecture for the primary font in the document, and assigned it the internal programmatic label of "Font 1." The Cross-Platform Conflict: TrueType vs. PostScript
is not a fixed product name. It is a placeholder reference meaning the font family of the CID-keyed font internally named F1 . To identify it, inspect the document’s font resources. cid font f1 family
With this technical background, we can tackle the F1 (or F1 Family ) component. While there are free fonts named "CID Font F1" that are legitimate typefaces based on Adrian Frutiger's design, the CID Font F1 Family you encounter in error dialogs is almost never referring to them. When a PDF reader displays or "Identity-H (CIDFont+F1)"
: It is not a specific brand or typeface family like "Arial" or "Helvetica". Instead, it is a name the PDF creator assigns to a font when it cannot or does not want to include the original name in the document's metadata. To identify it, inspect the document’s font resources