CIDFont+F1 (and similar names like F1Normal or F2) is a placeholder name used by PDF readers like Adobe Acrobat.
This refers to "Character Identifier," a method used to handle large character sets, often found in Asian languages or complex symbols. cidfont f1normal font free download best
When a PDF is created, the software may fail to embed the actual font. CIDFont+F1 (and similar names like F1Normal or F2)