I seem to be having this issue (not sure if it's entirely the same), but seeing that the last post dates back 2 years ago... it's got to be my install...
...anyway, i'm not sure how to describe my issue so i attached a screenshot of what happens when i import (drag-drop/open) a pdf file to OOo...
i'm running an old system (Vista) with all the updates available.
OOo is :
4.1.1. AOO411m6(Build:9775) - Rev. 1617669
2014-08-13 09:06:54 (Mi, 13 Aug 2014)
pdf import extension 0.1.0
I've tried the oracle version and it didn't matter because it gives me an error - to which i found the former to be the solution.
Anyway, I did get my task done using a chrome extension (not fun either)... but this is more for curiosity's sake.