I'm still using 1.8, need my phone to be stable for a while. But not too long
Anyway, after a quick search of this forum it doesn't mention acrobat reader. The one that is in 1.8 is old and does not include the REFLOW function. IMO, that's the difference between being able to open a PDF and actually read a PDF.
So I'd vote to update the reader to a newer release. FYI, there are at least 4 different versions all called LE 2.5. Only one of the ones I found has REFLOW (under View sub-menu). The one in the Sprint ROM DID have it. I found one version over on XDA that had it, and several that did not.