The file eval-stdin.php was part of the PHPUnit testing framework . It was designed to receive PHP code via stdin (standard input) and execute it using the eval() function. vulhub/phpunit/CVE-2017-9841/README.md at master - GitHub
The keyword refers to a critical security vulnerability known as CVE-2017-9841 . This vulnerability allows for Remote Code Execution (RCE) , which can lead to a complete server compromise if an attacker accesses this specific path on a web server. What is the PHPUnit Vulnerability? index of vendor phpunit phpunit src util php eval-stdin.php