Cid Font F1 F2 F3 F4 Info

The labels through F4 (and beyond) are generally assigned incrementally by the PDF producer. While the exact mapping can vary between documents, they typically represent different styles or weights of the primary fonts used in the original source:

: Instead of using a simple 1-to-1 mapping, CID fonts use a "Character ID" to link a specific character code to a visual glyph, regardless of the font’s original name. The Meaning of F1, F2, F3, and F4 cid font f1 f2 f3 f4

In the page’s /Resources: /Resources << /Font << /F1 10 0 R >> >> The labels through F4 (and beyond) are generally