The exhibit shows an HTTP GET request with a parameter that includes ; /bin/sh -c id.
This indicates a command injection attempt, where the attacker is trying to execute shell commands on the server.
Command injection vulnerabilities allow an attacker to execute arbitrary commands on the host operating system via a vulnerable application.
The use of /bin/sh and the -c flag is typical in command injection exploits to run shell commands, such as id, which returns user identity information.
Reference
OWASP Command Injection
Analyzing HTTP Requests for Injection Attacks
Web Application Security Testing Guidelines