just means it was the third font processed in that specific document. : In many standard PDF exports, CIDFont+F1 often represents Arial Bold, and CIDFont+F2 represents Arial Regular. could be any other font used in that specific file. Embedded vs. System
But here is the critical truth: Understanding what it actually is—and how to legally and effectively replace or recover it—is the key to solving your problem.
If you are looking for high-quality, free-to-use fonts to replace generic PDF fonts, stick to reputable sources: