In those cases, the free and open source OCRmyPDF is perfect to have around. This is a command line application that quickly converts any PDF file into a PDF/A file complete with optical character recognition, meaning you'll be able to search the text. Even better, it's completely free.
Once the application is set up, you can use it by typing ocrmypdf followed by the name of the document you want to add OCR to, and then the name of the document you'd like to create. So, for example, ocrmypdf before.pdf after.pdf would take "before.pdf", add character recognition, then create a new document called "after.pdf".
The process will take awhile, depending on the size of the document, and it might not be entirely accurate if the image quality is low. Even saying all that, though, I found this did a pretty good job even with the most ancient and poorly compressed PDFs I could dig up.
Credit: Justin PotYou get the idea: There's a lot here. Check out the documentation for more information because there's more this thing can do.
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