Originally Posted by katzenstreik
Your Kindle will be able to work with your persian pdfs just fine - even though it doesn't (yet) support persian or arabic fonts natively. Remember: displaying pdfs is like displaying pictures. So your Kindle will be able to support Klingon or Marsian if you have it on pdf!
While PDFs usually embed the fonts needed to display them properly, that is not guaranteed to be the case. PDFs can rely on system fonts as well [insert discussion of font licensing here]. If you try to view such a PDF on a device without that font, font substitution will occur.
But certainly any PDF created for general distribution should have the fonts embedded.