Relaunch your PDF, and the generic F1–F4 characters should render correctly using Adobe's standard substitute fonts. 2. View the PDF in a Web Browser
A common quick fix is to tell your PDF viewer not to look for the font on your computer, but to use its own internal rendering. Impossible fonts to be found / Fontes impossíveis de achar cid font f1 f2 f3 f4 free download free