Try changing the Font Family for the PDF Export. You can do that in the ExportSettings of RadGrid, see: Fonts / Unicode support
Alternatively, you can try exporting the RadGrid to PDF using Telerik Document Processing Libraries.
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.