How can I extract fonts from a PDF file?

"Note that depending on the source program and author they may have chosen to ""convert fonts to outlines"" in which case the actual live font data isn't embedded. This was often necessary back in the days of Postscript output and the practice is still held over today even though it's not really necessary.

cf. graphicdesign.stackexchange.com/questions/55780/is-it-necessary-to-outline-fonts-convert-text-to-curves-before-sending-them-to"