I think latest version of acrobat pro X 10.1.13 and adobe reader 11.0.10 have problem with embedded fonts.
If want to open a pdf with embedded font and i receive this message (sorry, translated by me from french)
"Impossible to extract the embedded font GILKAC+DIN-Regular. Some characters maybe display incorrectly or do not print well."
I have this problem on mac and Windows. Version 10.1.12 and 11.0.0 are ok and can open all these files.
Thanks for your help.