If the entire page highlights, it is likely a scanned image. If a cursor appears, the PDF document contains text. An alternate way to test for text within the PDF is to try to select all the text.
PDF-XChange Editor is a comprehensive PDF editor that ... Users will also benefit from improved handling of scanned documents, including edge detection, cropping, and dewarping, as well as ...
A PDF Editor tool is also there ... have images only (even if there is text content). So, if you have a scanned PDF file, you can first convert the scanned PDF to a searchable PDF, and then ...