The only pop to pdf conversion we know about at this time, would be export of old Samsung Popcon images to PDF format, which should be actually doable using any graphics editor, since these are just renamed .bmp files.
But several othe .pop file types exist as well, as maybe it is also related to something else. Generally speaking, you can export any document or graphics file to PDF format, as long as you can find some tool that can view/print these files.
Updated: September 6, 2023