I discovered that a "change" was made to a number of my websites (but not this blog) on June 6 that I have just learned about. It appears this change would have attempted to convince viewers of my sites to download a malicious pdf file but I'm really not sure what it looked like. My virus scanner caught it for me every time. I hope nobody was affected by this attack. I've removed the offending code and contacted my service provider. I'm going to have to keep a closer watch over things for a while - hate it when this stuff happens.