1. A computer-implemented method for detecting malicious scripts in web pages, the method comprising: executing a local engine at a client computer; executing an application at the client computer; intercepting by the local engine an access by the application to a web page at a universal resource locator (URL) under a domain; determining by the local engine scripts at the URL; determining by the local engine scripts at other URLs under the domain; determining by the local engine whether the scripts at the URL include a unique script which is at the URL but not at the other URLs under the domain; and sending by the local engine the unique script via a network to a script analyzer.
4. The method of claim 1 , wherein sending the unique script via the network to the script analyzer comprises sending a location of the unique script and not sending the unique script itself.