If there was ever a 64 bit version of AdobeReader it's been a well kept secret. i've never found it, and I have both the 32 and 64 bit Adobe repos installed. You can install the 32 bit repo... create the file
..then put this text into it,
name=Adobe Systems Incorporated
Then just do,
yum install AdobeReader_enu
Yum will pull in all the 32 bit deps, except, if your using the kmod-nvidia drivers from rpmfusion and haven't already done so, you'll also need to install "xorg-x11-drv-nvidia-libs.i686"