There are several photos online that show the same characteristic so I'm tempted to think the plant is like that.
Anyway, a few questions...
The brown areas are soft / mushy?
If I understood correctly, you recieved the plant like that. Am I correct?
Yes, I received the plant 4 days ago, but the brown parts aren't mushy - the browner they are, the firmer they are. This is why I don't think it's rot.