>In theory, in my case it may be legit. I don't use Adobe often and I don't re-start my laptop often, so may be it finds new updates every time I re-start.
>I'm using Adobe Reader 9. I made a very quick search and it doesn't seem to bring anything relevant.
Just keep an eye to see if you receive a message from something like "Windows XP Antivirus Centre" or "Windows 7 Antivirus Centre" (do not remember exact name) telling you that you have a virus/attack, then you will know that you have a virus, otherwise it just it is what you said.
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges