Just as a tiny nitpick: PDFs can be just a collection of images. If there’s text I would hope that they’re embedded as text or vectors, which is what would usually happen if you export a document from a program (that isn’t completely bs). So texts / vector graphics etc should not be images usually (unless you scan a document as a PDF - which I hate with a passion but can see that people prefer a single PDF over a collection of image files). Even then you could OCR the imges / PDF to make it searchable etc. Anyway in this case it seems to be a collection of images indeed ^__^