OK, last bit of information. It's been a while since I messed with this. I simply don't use Office Mobile because I have little need to lately.
When you open the Office file you tap the three dots ... then tap 'save as', then tap 'Save to' you can select Phone and possibly SD card if my memory serves me correctly.
Then you'll be able see those files on your phone. Not entirely sure if the PDFs will be the same.