Alf,
That machine has nothing to do with pprune, its in the Philippines , adsl-131.139.86.info.com.ph, i.e. nothing to do with pprune.
The Internet Service Provider that that machine is connecting through the internet is
INFOCOM Technologies Inc
31/F PLDT Tower II
6799 Ayala Avenue, Makati City
Philippines
Port 2946 is a TCP/UDP prot for fjsvmpor, however I suspect Norton has detected a trojan, not fjsvmpor.