In short: – they are ghosts left behind by missing typefaces.
If you have access to Acrobat Pro, you can fix the file permanently: Tools > Print Production > Preflight PDF Fixups Embed missing fonts Analyze and fix Why "Gratis" Downloads are Risky
: Users often find that opening the PDF in macOS Preview or a web browser like Chrome resolves the display issue.
If you are looking for these fonts because a PDF is not printing correctly or an error message says "Font not found," you do not need to download the font. You need to fix the document.
created by software (like PDF exporters or printers) when it fails to properly embed the original font into the document. Placeholder Names: