Mobile code is any application that moves across a network that may run on a local system without requiring installation. Examples of mobile code are scripts (JavaScript, VBScript), Java applets, ActiveX controls, Flash animations, Shockwave movies (and Xtras), and macros embedded within Microsoft Office files.
Mobile code can also be downloaded and run on a target workstation by email either by an email attachment or an HTML email body. Due to their portable nature, they download and execute without the user's awareness.
Mobile code can also be encapsulated or embedded in other file formats originally intended for read-only purposes, like JavaScript in a PDF.
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