The terms in the context of CID (Character Identifier) fonts are usually not specific font names, but rather internal font aliases or "mapping tags" found within PDF documents.
If the PDF wasn't "saved with fonts embedded," your computer can't find the original font and uses these generic "F1-F4" labels instead. Common Identities:
If you pay for Adobe Creative Cloud, many of the actual fonts (KozMinPro, AdobeMingStd, etc.) are included. You can install them via the → "Fonts" → search for "Kozuka" or "Adobe Ming."