http://www.arctic-cooling.com/catalog/product_info.php?cPath=39_&mID=127
"Since the MX-2 does not contain any metal particles, there are no problems regarding electrical conductivity or capacitance. Unlike other silver and copper compounds, MX-2 ensures that contact to electrical traces, pins and leads cannot result in any damage."
Yes -- that would indicate that this product is not "silver thermo paste" as referenced by the question, but would seem to be seem to be a ceramic based thermal paste. Had the question asked about 'silver-colored thermo paste', that would have been a different critter. So, I guess the answer would be 'not everything silver-colored is silver'... and all that glitters is not gold.
Point being -- no matter what, don't get the thermo paste on the CPU-pins. It's intended for use on the interface between the CPU and the heat sink.