When a PDF creator forgets to embed the original font file into the document, the PDF viewer assigns a generic label like CIDFontF6 to the missing characters.
If you do not need to edit the text, ask the original creator to "create outlines" or "flatten" the PDF before sending it.
If possible, obtain the original file (e.g., in .ai , .psd , or .indd format) before it was converted to PDF. The original software will often prompt you to replace the missing font, allowing you to use a similar font you already possess.
Your operating system's font cache has become corrupted, preventing it from recognizing Adobe’s system fonts.
The font CIDFont+F1 is Arial (blod) and CIDFont+F2 is Arial (Regular) Which font type? - Adobe Community
– Libraries that generate PDFs programmatically sometimes produce CID‑keyed fonts as a default, especially when handling Unicode text.
: When a PDF is created, the software may rename embedded fonts (e.g., "CIDFontF1", "CIDFontF6") to handle complex character sets like those in Chinese, Japanese, or Korean (CJK).
– Some PDFs embed the glyph outlines (so the text prints and looks fine), but omit the ToUnicode mapping that allows text to be copied correctly. In such cases the font will be listed as a CIDFont, and copying may produce nonsense.
"CIDFont+F6" is likely not a specific font you can download, but rather a generated by software (like Adobe Acrobat or Illustrator) when a PDF is exported without its original fonts embedded.
If you are getting an error in Adobe Illustrator or another program saying CIDFont+F6 is not found , it means the software cannot map the generic substituted name back to a usable font on your system. Can I Download CIDFont+F6?