Welcome to WebmasterWorld Guest from 18.104.22.168
Forum Moderators: Ocean10000
# UA "Mozilla/4.05 [en]"
# UA "Mozilla/5.0 (Slurp/cat; email@example.com; [inktomi.com...]
# UA "Mozilla/5.0 (compatible; Yahoo! Slurp; [help.yahoo.com...]
# UA "YahooSeeker/1.1 (compatible; Mozilla 4.0; MSIE 5.5; [help.yahoo.com...]
# UA "slurp"
# UA "Fast Crawler v X"
# UA "Fast Crawler v X(compatible; Konqueror/3.2; FreeBSD) (KHTML, like Gecko)"
# UA "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT)"
Not sure if it's repeating hits on the same files within the same month but I would assume a yes though I have a lot of files!
I do like slurp because it reminds me of old urls I have not set 301s for yet.
You don't mention the actual user agent of your culprit so it's hard to help you out. There are robots looking for multi-media files, incl. images and for shopping search in addition to the usual suspects for robots.txt and organic search indexing.