Thank you for letting us know about this problem.
Indeed when exporting PDFs RadRichTextBox for Silverlight does not embed any fonts in the resulting PDF, as Silverlight itself does not provide all the required information for a font to be embedded. Currently we are not aware of a solution of this problem without causing issues with application size related to embedding fonts. Your option is to use only fonts that are available on MAC, such as Arial and Times New Roman.
Future versions of RadRichTextBox for WPF might be able to resolve this issue on the server and this might be a solution for you if your application has WPF enabled back-end.
the Telerik team
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