1) Read in the attached file ("a.pdf").
2) Select "Export a PDF>text (plain)" and save to the file "a.txt"

For me, the file is nearly empty, 14 bytes in size (see attachment). a.pdf has plenty of OCR text and cut-and-paste copies plenty of good-looking text. I don't know how a.pdf was originally created, but in any event export of text should produce something better than this I think.