Cid Font F1 F2 F3 F4

Extract the font using tools like pdftops (Xpdf) or mutool extract . Re-embed the missing CID font or substitute it with a compatible one (e.g., using Ghostscript’s -dNOPLATFONTS ).

mutool show document.pdf /Resources/Font cid font f1 f2 f3 f4

With modern PDF/UA (universal accessibility) and PDF 2.0 standards, there is a push toward: Extract the font using tools like pdftops (Xpdf)