Another tip:

If Banks are downloaded directly from the merchant's bank the document properties should show:

Wells Fargo: TrilliCom LCC as the Author & TRCA2P14 as the PDF Producer
Chase: PDF Producer - OpenText Output Transformation Engine
Bank of America: PDF Producer: TargetStream StreamEDS
Key Bank: Author: "Registered to: KEYSVC"
US Bank: Producer: 303j Linux
Capital One: Producer: CrawfordTech PDF Driver Version 4.0

it's also safe to say that if the merchant's name is listed under Author & the PDF producer is Microsoft Print to PDF then they are probably fake.