You can decode the URL characters (eg. all the %ed, %e5, type of characters in the url) here:
http://www.exadium.com/tools/online-url ... code-tool/
I have done so, and they appear to be various chinese characters, such as:
So, unless your website is in chinese, I would assume it is someone trying to do something they shouldn't, maybe a bot...
Sorry I can't be more help.