In Adobe Illustrator, place the PDF and use Object > Flatten Transparency with the "Outline text" option checked. This converts text to shapes, making the specific font unnecessary for viewing.
If you are struggling to open or edit a PDF because of these missing F1/F2 labels, try these technical fixes: Ghostscript Processing: You can use Ghostscript to force-embed missing fonts by running a command like ps2pdf input.pdf output.pdf cid font f1 f2 f3 free download high quality
"CIDFont+F1, F2, F3" are not specific fonts you can download. They are or "aliases" created by software (like Adobe Acrobat or web browsers) when it fails to properly embed the original fonts into a PDF. In Adobe Illustrator, place the PDF and use