How to convert scanned PDFs to instantly editable text using automatic OCR software in Acrobat Acrobat DC:
Open a PDF file containing a scanned image in Acrobat.
Click on the Edit PDF tool in the right pane. Acrobat automatically applies optical character recognition (OCR) to your document and converts it to a fully editable copy of your PDF. This will allow the selection of text from within the document.
Remember to choose File > Save As and type a new name for your editable document.