Font not recognized on Adobe Acrobat XI Pro

Hello,

editing text on a pdf file I receive a missing fonts message that disappears after installing the Din font.

The problem is that this font is used in either Regular, Bold, Medium, Alternate and  Black version and only the first font installed is seen by Adobe Acrobat.

For example, if I install the DIN font  in this order, Regular, Bold, Medium, they are correctly recognized by Windows control panel font utility but Adobe Acrobat XI Pro recognize only the first font installed (Regular).

All suggestions are welcomed.