I'm stumped. As directed, I printed the Font Awesome Cheatsheet to PDF. When I open it with Acrobat Reader, it looks fine. However, when I try to open it with Illustrator, I get this warning:
The font MuseoSlab-500 is missing. Affected text will be displayed using a substitute font.
The font OTS-derived-font is missing. Affected text will be displayed using a substitute font.
The font ProximaNova-Regular is missing. Affected text will be displayed using a substitute font.
How can I 'fix' the PDF, so that I can see and use the icons in Illustrator?