You typically encounter these names when opening a PDF in a vector editor (like Illustrator) that doesn't have the original fonts installed. The software sees the embedded "CID" data—which is excellent for cross-platform rendering and supporting complex character sets—but cannot identify the specific local font file to allow editing. Quick Fixes for "Better" Results
In a standard F1 (Helvetica) scenario, modifying the font to add a custom logo or ligature is difficult. In a scenario: cid font f1 f2 f3 f4 better
Use :