Below i s quote from my response in your support ticket on the same question:
"Please check the font requirements listed in the Design Considerations for PDF Rendering, and verify the server machine has the font installed on it. Note that Telerik Reporting works only with TrueType fonts - Font is missing in report designers.
If you need further help, please let us continue the discussion in your support ticket. We can update this forum thread at the end for anyone concerned.