However, if you do not want to do that, you can always open PDF files in Protected View in Word. It helps you block any macros from running right after opening the file in Word.

Microsoft Word can accommodate a surprising number of file formats, and even take in Excel and PowerPoint data, though it might look funny. Here's how.

But they're very difficult to edit — by design. If you need to "crack open" a PDF file and make changes, though, you can do that by converting the PDF to Word.