PDF editor - free - drag and drop pages and modify how everything looks. LibreOffice. Ye, people are terrified of it. You open the drawing package. Open the PDF. Start adding text, editing elements, swapping out graphics, filling in forms, moving pages around and all that kind of jazz. People are scared to death of using it. Just today, someone, who has LibreOffice on their computer, would not use it to modify the pages of a PDF they had just scanned in. Why? Because they had never done it before. How has Microsoft made the whole world addicted to their products?
I want to run a double blind study that brands LibreOffice Draw as Adobe Illustrator Lite. Then, have a bunch of lawmen people run though editing and modifying existing drawings and indeed PDF files. Then making up some drawings themselves. I bet money the test group who will see the name "LibreOffice Draw" will hate the package and the group that sees "Adobe Illustrator Lite" loves it. Then I want to re run the study with "Microsoft Architect for Office 2014" or something silly like that. I bet the results are the same.
Microsoft Office does not have the built in software for editing PDF files. Adobe products really only allow one package to edit PDF files and it is $200. There are a couple open source software packages out there that do it, but LibreOffice Draw is the best by miles for my money. Oh, wait, my no money because LibreOffice is free to consumers.