Gotta check my car too.. I have 08 too..
I just checked mine.. It looks same as urs and I think it's normal..just looked at the pic with the arrows. I don't think you have any issue. Looks more like normal under-hood grime mixed with a minimal amount of oil that seeps through that gasket over time. No biggie. Clean it up and check it again in a week or two. If it's still clean, you're good.