Get the Whitepaper called Android Vulnerability in ES File Explorer. It provides an overview of manual exploitation of ES File Explorer version 4.1.9.7.4 using counterfeit requests over HTTP.
You can download it from the following link: https://packetstormsecurity.com/files/download/161657/CVE-2019-6447.pdf
Source: https://packetstormsecurity.com/files/161657/Android-Vulnerability-In-ES-File-Explorer.html