Exploit:PHP/Preamble is a detection for a family of various PHP scripts.
The scripts are used to test whether a particular site is vulnerable for a Remote File Inclusion (RFI) exploitation.
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An exploit is a short code that uses a vulnerability in an operating system or other software to run unauthorized code on target computers.
The scripts belonging to this family are usually used to test whether a site or a webpage is vulnerable to a Remote File Inclusion (RFI) vulnerability.
The scripts test various methods an attacker can use to introduce a malicious backdoor script onto the affected server.