Press "Alt-F2" to open a command line prompt within Unity. Type the command for Evince with your PDF file's name, file extension and its full path relative to the Home directory.

Place the PDF file you want to convert into the same directory as the extracted files. Open the Start menu and click "All Programs," then "Accessories" and then "Command Prompt" to open the ...

If you want to extract highlighted text from PDF file as a plain text file, then this post covers some good free PDF Highlight Extractor software to do that.