title: opening the validated pdf file does not show text
body: <p><a href="https://drive.google.com/open?id=10EOaaJk6WZqLe2hQjgcs5Zm9KqOzdKr7" rel="nofollow noreferrer">this</a> pdf file has been validated by online pdf tools, I have also checked it as per pdf reference book by Adobe, but when I open it, there is no text in this file while there should be a line. Could someone please get me the problem in this file? thanks in advance.</p>