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Javascript malware is code written in the Javascript language that is maliciously used to compromise a computer or network, sometimes without the user's knowledge. It is often distributed as part of malicious software bundles or can be injected into websites through malicious advertisements or other means.

JavaScript, however, also has a dark side; hackers can use it to create malware that infects a computer without any user interaction. JavaScript enables attackers to automatically run code in a victim's Web browser when they visit a malicious website.