/Distiller_CID_Fallback << /CIDFont /F1 /Normal /Fixed >>
Thus, seeing cidfont f1 normal fixed in a tool like pdffonts or pdfid often indicates a where the original font metadata was stripped. cidfont f1 normal fixed
Understanding CIDFont+F1+Normal+Fixed: A Deep Dive into PDF Font Internals /CIDFont /F1 /Normal /Fixed >