1. Symantec-Broadcom-Horizontal/
  2. Security Response/
  3. Attack Signatures/
  4. Web Attack : JS.Downloader Download 3

Web Attack : JS.Downloader Download 3

Severity: High

This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.


This signature is to detect JS.Downloader activity.

Additional Information

JS.Downloader is a malicious script that may arrive as an attachment in spam emails.

The emails may have different subjects and body messages. For example:

Subject: Outstanding invoices - [RANDOM LETTERS]

Attachment: In[RANDOM LETTERS].doc


Kindly find attached our reminder and copy of the relevant invoices.

Looking forward to receive your prompt payment and thank you in advance.

Kind regards,


When the script is opened, it will download and execute malware from a remote location.


  • Various Windows platforms.


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