Published Nov 27, 2012 | Updated Sep 15, 2017


Detected with Windows Defender Antivirus

Aliases: Cool Exploit Kit (other) Exploit.JS.Pdfka.ggz (Kaspersky) Cooexp.A (Norman) EXP/JS.Expack.CO (Avira) JS/ (McAfee) Mal/ExpJS-AN (Sophos)


Exploit:JS/Coolex.A is script contained within an exploit pack known as the "Cool Exploit Kit". It can install arbitrary malware on your computer, including variants from the Trojan:Win32/Reveton family of ransomware trojans that may lock your computer and demand payment of a supposed fine.

For more information on ransomware, please see our FAQs at

Use up-to-date software

This malware exploits known vulnerabilities in Java, Adobe Flash, Adobe Acrobat, and Adobe Reader. Install the updates available from the vendor so that your software is no longer affected by these vulnerabilities. You can read more about these vulnerabilities, as well as where to download the software update from the following links:

It may be necessary to remove older versions of Java that are still present. Keeping old and unsupported versions of Java on your system presents a serious security risk. To read more about why you should remove older versions of Java, see the following information.

To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:

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