Here’s a helpful post regarding and working with new CIDFonts in PostScript or PDF generation.
qpdf --qdf --object-streams=disable broken.pdf uncompressed.pdf cidfontf1 font new
No. It is not malware.
If you have ever dug into the raw structure of a PDF file—perhaps to debug a corrupted document, analyze a malformed report, or extract text from a proprietary form—you may have stumbled upon a cryptic line inside the fonts dictionary: . Here’s a helpful post regarding and working with