Hi. It sounds like you need to scan to get to the PDF stage, but if (for one reason or another) you have something scanned already into a PDF, you can make it searchable (do OCR on it) in DT (it is packaged with the product).
Every day I am cutting off spines with a guillotine-style paper cutter and scanning old books and journal articles into PDF format. Some of them would be useless even for reading copies, because they are in such a terrible state, but as PDFs, they get a new lease on life. In fact, I prefer to buy old copies of books in terrible condition (extremely inexpensive) just to digitize them.
I recommend Fujitsu’s ScanSnap series. For regular scanning (in my case, hundreds of pages a week), the ix1600 is well worth the money. There are other high-quality scanners from other companies (Epson, for example), but Fujitsu’s software + hardware + price has been the best combination for me. Files are automatically made searchable with OCR by Adobe, which comes bundled with the product. For hopelessly crumbling materials that won’t survive a pass through the ix1600 scanner (100-year-old journals are fine, but some paperbacks from just a few decades ago might as well be crumbling stale bread—poor quality paper and binding), items you don’t want to deconstruct by cutting off the spines, or larger items that won’t fit into the scanner, Fujitsu’s SV600 is wonderful, because it works by capturing an image from overhead.
If it really is just a handful of pages, one inexpensive option is an iPhone using the ScannerPro app, which also performs OCR and exports files as PDFs or images. The iPhone cameras are pretty good, especially in the right lighting with a steady hand or device (less than ten dollars these days) to hold it for you. I also use this app on a daily basis for my handwritten notes and newspapers. The developers are Ukrainian and nice folks, so I like to think / hope that some of the money is helping someone over there. I’ve been working with their products for many users (sometimes as a beta tester) and I can say without reservation that they have been amazingly high quality.
To sum up—no need to subscribe to Adobe. Take that money (actually, a lot less than you’d pay for 2 or 3 years of Adobe) and get high quality hardware + software that you can use for decades.
As a final note, for older items that are not subject to copyright law restrictions, many things can be found online already in PDF form. There are digital treasure troves out there from legitimate sources. Even with copyright, authors and publishers sometimes make new items available immediately online for free. The Internet Archive ought to be your first stop. It has some items from the Oxford series, though Singer’s edited volume (the one I have on hand at home) doesn’t appear to be there, for example, so maybe it isn’t complete online.