Mike, I just popped a PDF into my GIMP and imported it as first, layers (no good) and images (okay), but each images gets its own filename even when exporting to TIFF. That means an independent program is needed to make the multi-page conversion work for your purposes. A quick check with The Google shows a number of online services to perform this task, as well as a number of free download, likely supported with embedded adware, beware!
