pdffonts your_document.pdf Look for a line where the "font" column reads something like F1 or Arial+F1 . The "type" column will show CID TrueType or CID Type 0 . To put "F1" in perspective, here is how it compares to other naming conventions in the wild:
Enter Adobe Systems in the 1990s. They developed the to solve this scalability issue. Unlike traditional fonts, a CID font separates the character collection (the Rosetta Stone of glyph IDs) from the CMap (Character Map), which tells the system how to map a character code to a specific glyph ID. cid font f1 family
| Identifier | Typical Meaning | Use Case | | :--- | :--- | :--- | | | Generic/synthetic fallback | Placeholder for missing CJK fonts | | HeiseiKakuGo-W5 | Specific Japanese font | Professional East Asian typesetting | | Ryumin-Light | Specific Japanese serif | Traditional publishing | | Identity-H | CMap (not a font) | Unicode mapping | | C0_0 | Subset of embedded font | Web-optimized PDFs | pdffonts your_document