Save and search PDF recieved as email attachment?

Frankly, I have not been able to find the solution to this, and I wonder if there even is one without jailbreaking my phone. Is there a way - paid or free app, doesn't matter - that allows me to save PDF files recieved as email attachments and then read them and search within them?

Please tell me it is so. My old droid phones could do that out of the box, and I am surprised something so basic as saving pdf attachments isn't built into the iPhone. Or is it?