Save email attachment and add to a specific pdf file
I was wondering if there was a way in which if I receive an email with a specific subject line i.e Monthly Banking Sheet, that it downloads the jpg attachment and adds it to the end of a pdf document I have on my desktop. The current pdf document I have is called "Monthly". I understand that I may need to use Automator and an Applescript but as I am a beginner I would appreciate if someone could talk me through how to do this. Thank you
iPhone 5s, iOS 7