It would probably be wise to watch and see what it's doing... but yes, those very (very) old CPANs will install new versions of perl, sometimes without asking. The very best way to deal with this would be to install a newer version of perl (if possible) from a solaris binary repo.
I don't have the permissions to install the modules, so I asked the another guy who is having the persimissons to install. That is the reason I don't have log what happened while installling.