The most successful fix reported by users on the Adobe Community is to use macOS's built-in Preview app to re-render the file. CIDFont+F1 issue | Community
When a software program exports a PDF but fails to embed the fonts properly, it gives them generic placeholder names like or CIDFont+F2 . Your Mac sees these names and, because they aren't real fonts installed in your system, it displays an error or replaces the text with dots. Why You Shouldn't "Download" It
Because "CIDFont+F1" is a generic placeholder, searching for a "free download" often leads to untrustworthy sites. In reality, the font you are missing is likely a common one like: Times New Roman Tahoma How to Fix the CIDFont F1 Issue on Mac