Hi lwalkercfo,

Currently, you can only attach the report as an Excel file. The ability to attach it as PDF file would greatly help your business. I'll make sure pass this along to our product team for future product enhancement. You'll want to either attach it as an Excel file or send the PDF directly through email. 

Here's an article for more detailed steps: Set Schedule and email Information For A Memorized Report.

In case you want to create a memorized report with reminders: How to create Memorized A/R Reports with Email Reminders

Let us know if you have further questions, I'd be right here help.