If you extracted a page from a larger document, the font "map" (CMap) might have been lost.
The PDF was created without the full font data, so your computer doesn't know how to "draw" the characters. Cid Font F1 F2 F3 F4 Free Download
The labels are internal placeholders or "shorthand" names generated by software (like InDesign, Illustrator, or Acrobat Distiller) during the PDF export process. If you extracted a page from a larger
Labels like CIDFont+F1 are often just a "random name made up by an app" to represent a subset of a real font. For instance, CIDFont+F1 might actually be Arial Bold and CIDFont+F2 might be Arial Regular . Why You See "Missing Font" Errors Labels like CIDFont+F1 are often just a "random
When a PDF is created, the software may convert a standard font (like Arial or Helvetica) into a "virtual" CID font to optimize rendering or support unique characters.