Are there any virtual printer drivers for Mac that allow you to print something to a high quality JPEG (150-300dpi) in the same way you can print a PDF?

I’ve got a password protected PDF which I can edit but cannot add an image to (due to permissions restrictions). One way around this would be to print it as an image file and edit that image and convert to PDF later. I’m not having any luck “Saving as…” a JPEG, but hopefully I can use a printer driver which tricks Acrobat into thinking it’s actually being printed. Any ideas?