ECompositeDocumentHandler Resources module is part if Autodesk Design Review, a viewing application that enables all members of the project team to easily view, measure, markup and print designs shared electronically. Built around the DWF file format, Design Review enables users to view and print complex 2D and 3D drawings, maps, and models published from Autodesk design applications or from the DWF Writer.

ecompositedocumenthandler.dll is loaded as dynamic link library that runs in the context of Internet Explorer. It is marked as a Safe for Scripting ActiveX control for IE which allows it to execute scripts within the web browser which is allowed becuase the module is digitall signed. The file is digitally signed by Autodesk which was issued by the VeriSign certificate authority (CA).