CIDFontF4 often comes in multiple weights (Regular, Bold, Heavy). Ensure you downloaded the correct variant. If you only have the Bold version, text using the Regular weight will still fail.
Use these methods to find out which font is actually being used behind the "cidfontf4" label: cidfontf4 font free download free
: The "F4" part is often an arbitrary identifier assigned during the PDF creation process. In one document, "CIDFontF4" might be Arial Unicode MS , while in another, it might be Embedded Subset CIDFontF4 often comes in multiple weights (Regular, Bold,