Not sure what this, however don't believe it has anything to do with their AV software.
Symantec Corp Swapdrive Norton Data Services QWEST-IAD-SCSNDS10 67.134.208.128 - 67.134.208.255
67.134.208.128/25
67.134.208.134 - - [02/Jun/2013:11:45:29 -0600] "GET /NyFolder/MySub/MyPage.html HTTP/1.1" 200 18975 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13"
QWEST-IAD-SCSNDS1 63.146.183.64 - 63.146.183.71 63.146.183.64/29
WEST-IAD-SCSNDS2 63.146.183.72 - 63.146.183.79 63.146.183.72/29
QWEST-IAD-SCSNDS3 63.146.183.80 - 63.146.183.95 63.146.183.80/28
QWEST-IAD-SCSNDS4 63.146.183.96 - 63.146.183.127 63.146.183.96/27
QWEST-IAD-SCSNDS7 63.236.107.176 - 63.236.107.191 63.236.107.176/28
QWEST-IAD-SCSNDS10 67.134.208.128 - 67.134.208.255 67.134.208.128/25
FWIW, this (MyPage) has been quite active over the past few days.