If you have the or the conference/journal name, please provide them, and I can locate the specific academic paper for you.

: Websites like Font Squirrel, DaFont, and 1001 Free Fonts are popular platforms for downloading free fonts. While these sites offer a wide range of fonts, not all of them may have the CID F1 font. When you find a potential source, make sure to check the licensing agreement to ensure it's suitable for your needs.

Opening the problematic PDF in a viewer like macOS Preview and then re-exporting it as a new PDF often "flattens" the fonts, making them readable.