: Open the file in a browser (like Google Chrome) and choose Print > Save as PDF . This often forces the browser to embed standard system fonts.
If you share the or what software/project you’re working on, I can give a more specific step‑by‑step fix. CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
generated the PDF, if you know? (e.g., AutoCAD, a scanner, Word) : Open the file in a browser (like