You want to read character by character an PDF File.
More precisely, reading the PDF into a character recognition (OCR) software, if your PDF is an all graphics file (indicated by the impossibility of highlighting text).
The results of course depend on your OCR software and the settings you apply before recognition.
In any case, the procedure is likely to involve a lot of work and only pays off if the text contains lots of repetitions and you can use a CAT software afterwards. Otherwise, just use a printout and type the translation into Word.
I suggest that you'd better choose a suitable tool to help you.Whenever I have such a similar need, I use this professional PDF sdk.Then you will understand: file conversion is a convenience. It saves your having to retype document in Word from scratch. A converted file cannot be used as a final document. You will save yourself untold hours of frustration if you get your brain around this simple fact.
Download the free trial of Yiigo and try it. Let me know if this helped and were able to do this with success.