Bienvenue sur l’Encyclopédie des Virus de Panda Security.
Doubleclick is a cookie.
Cookies are small text files stored in the browser on the user's computer, when visiting web pages.
Cookies store information that can be used for several purposes: to personalize web browsing, to gather demographic information about how many users visit a page, to monitor which banners are displayed to the user, etc.
These uses are not, in theory at least, malicious.
Doubleclick uses the following propagation or distribution methods: