The pepperflashplugin-nonfree package in wheezy-backports is broken, as it downloads the flash plugin from the latest chrome release and installs it. The latest release links against libc6 2.14 which is not available in wheezy.
# Check your /var/cache/pepperflashplugin-nonfree/ for cached chrome releases. # I found google-chrome-stable_35.0.1916.153-1_amd64.deb which I used. # If you don't have the ar command, apt-get install binutils $ ar x google-chrome-stable_35.0.1916.153-1_amd64.deb $ tar --lzma --extract --verbose --file data.tar.lzma $ sudo cp opt/google/chrome/PepperFlash/libpepflashplayer.so /usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so # Restart chrome