Eu usaria o Font Forge porque é uma solução gratuita, de código aberto e de plataforma cruzada, que pode extrair dados de fonte de arquivos PDF.
link
Use o arquivo > Abra o item de menu.
DA DOCUMENTAÇÃO:
FontForge can also read (many) fonts out of a pdf file. FontForge usually does not list pdf files (because they aren't really designed as mechanisms for transporting fonts and most such fonts will be incomplete due to subsetting and other optimizations), but you can always type in the name of one directly (or use the [Filter] button to define a filter for pdf files).