Type :


Aliases :

Js, Trojan-downloader:JS, Js.trojan, Js.trojan-downloader


The identifier 'JS' is F-Secure's platform designation for a program written in the JavaScript language.


Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

JavaScript is a popular scripting language (only loosely related to the Java programming language) commonly used on Web pages to add interactivity to its elements.

As with other languages, JavaScript can be used to create software containing malicious routines, such as:

Malicious JavaScript code embedded on a webpage may also be used to download malware onto a user's device. Examples of malware delivered this way include:

A detection with the 'JS' platform identifier may also be used to identify a webpage (HTML or CHM) that contains suspicious JavaScript code. In this case, the malicious script is most commonly an exploit. An example of such suspect code is: