I have tested it on my local environment (SQL Server Reporting Services 2008 R2, Adobe Reader 11.0 on Windows 7), the default Font dispaly well on PDF file. In your scenario, if you use a custom font, then the custom fonts that are used in the report
must be installed on the report server and on the client computers used to view the report because of PDF rendering extension does not embed fonts. For the detail information about it, please refer to the link below to see Font Requirements section. http://technet.microsoft.com/en-us/library/dd255291(v=sql.105).aspx
Hope this helps.
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