Now, we reach the core of our keyword: .
In PDF document structures, , F2 , F3 , and F4 are internal labels assigned by PDF-generation software (like Adobe Distiller or Microsoft Print to PDF) when it cannot or chooses not to embed the original font names. These are not "real" font names you can find in a standard font library; rather, they are placeholders for Character Identifier (CID) fonts used to handle large character sets or encoding issues. Breakdown of CID Font Labels cid font f1 f2 f3 f4
The suffixes (and sometimes beyond) are arbitrary internal names assigned during the PDF generation process. In many cases, these numbers correspond to different weights or styles of the same font family used in the document: Impossible fonts to be found / Fontes impossíveis de achar Now, we reach the core of our keyword:
: Modern OpenType fonts often get converted into CID encoding when they are embedded into a PDF to ensure all characters display correctly. Decoding "F1, F2, F3, F4" Breakdown of CID Font Labels The suffixes (and