Best I can figure, someone is testing a bot before they go hog wild with spamming. How else to explain a few spam comments I've seen on some of the CST blogs (and others) that look like this:

fLaa4mm8xjvC7 zDXPtJZOPDRt6B dvp6jiPulPCwEb

All of them have been on older posts - I suppose as some sort of "will the owners notice" kind of test.