I'm guessing why it isn't in a page-by-page format is the manufacturer was lazy and simply provided the file they used to print the little folded-up manual/brochure that would have originally came in the box with the device.
The best thing to do would be to use a PDF editor and manually crop out each "page", then re-compile to a new PDF that has everything indexed like normal. I don't know any specifically to recommend, though I'm sure the full version of Adobe Acrobat would work though it's kind of expensive. If you already have it, then stick with that.
