JAR

• A JAR (Java ARchive) file is a package file format used to aggregate many Java class files, metadata, and resources (like images or configuration files) into a single file for distribution.

• JAR files are essentially ZIP archives with a specific structure, used to deploy Java applications or libraries.

Reverse Engineering JAR Files

jadx (and jadx-gui) is a popular open-source tool to decompile and analyze Java bytecode from JAR files into readable Java source code.

jadx-gui custom-apoc-extension-1.0-SNAPSHOT.jar

Command injection in Java applications often occurs via unsanitized use of Runtime.exec(), ProcessBuilder, or shell commands.

The pom.xml primarily lists the application's dependencies, along with build configurations, plugins, and project metadata. It defines which external libraries the application needs to compile and run.