Banking is very PDF heavy, and many of these PDFs have a ton of logic baked into them. Some of the loan documents do literally all of the math for you so the loan officer just inputs the amount, term and APR and the PDF outputs a fully-filled loan document. Its pretty magical to see until you peek under the hood at the code and oh-my-god-what-the-hell-how-did-this-ever-work-in-the-first-place-this-must-be-purgatory