Dex file extraction method, system and terminal device

The invention is applicable to the computer technical field, and provides a dex file extraction method, a system and a terminal device, comprising the steps of monitoring whether an application program is started or not; if the application startup is detected, the extracted underlying code is loaded, and the underlying code is injected into the original code to load a complete dex file; extractingthe complete dex file. By changing the way an application works, when an application startup is detected,injection of underlying code, in order to load the complete dex file and extract the completedex file, we can get the complete original program of the application program, and solve the problem that when the application program is shelled by the traditional shelling method, only the class name can be obtained, but the complete original program can not be obtained. 本发明适用于计算机技术领域，提供了种dex文件抽取方法、系统及终端设备，包括：监测应用程序是否启动；若监测到所述应用程序启动，则加载被抽取的底层代码，并将所述底层代码注入到原有代码中以加载完整的dex文件；抽取所述完整的dex文件。通过改变应用程序的运行机制，在监测到应用程序启动时，注入底层代码，以加载