CID fonts are powerful tools for handling complex typography, but their structure makes them prone to mapping errors when passed between different software systems. When you encounter a PDF with generic fonts like F1, F2, F3, or F4 acting up, the goal is to the data—either by re-printing the file to flatten the fonts or using tools like Ghostscript to re-embed them properly.
If you download a repack from a torrent site, you are almost certainly downloading one of two things: cid font f1 f2 f3 f4 repack