Você pode usar o acesso de URL, conforme descrito aqui: http://msdn.microsoft.com/en-us/library/ms154040(v=sql.105).aspx
http://<Server Name>/reportserver?/Sales/YearlySalesSummary&rs:Format=PDF&rs:Command=Render
http://<Server Name>/reportserver?/Sales/YearlySalesSummary&rs:Format=PDF&rs:Command=Render
