How Do I Test a PDF Attachment on my Email before I Open It?

Hello,

I am a real estate broker. I received a peculiar email from a gent wanting to purchase a very expensive home. He a says his pre-approval letter is attached. I don't know this person, so I am leery of opening up the PDF. Is there any way to scan it first? Or is there even any danger opening up a pdf?

 

Thank you very much!