Trojan-dropper:JS/PdfDropper

Threat description

Details

CATEGORYMalware
TYPETrojan-dropper

Summary

Trojan-dropper:JS/PdfDropper identifies specially-crafted PDF files that drop and execute a document file. The dropped document file in turn contains code that downloads and runs additional harmful programs.



Removal

Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

Security programs will sometimes unintentionally identify a clean program or file as malicious if its code or behavior is similar to a known harmful program or file. This is known as a False Alarm or False Positive (FP).

For example, 'tmp.edb' and other '.edb' files stored at the location 'C:\WINDOWS\SoftwareDistribution\DataStore\Logs\' may be unintentionally detected as malicious by various security programs.

Checking for a fix

In most cases, a False Positive is fixed in a subsequent database release; updating your F-Secure security product to use the latest database is enough to resolve the issue. If you suspect a detected file may be a False Positive, you can check by first updating your F-Secure security product to use the latest detection database updates, then rescanning the suspect file.

Send a sample to F-Secure Labs

After checking, if you believe the file or program is still incorrectly detected, you can submit a sample of it to F-Secure Labs for analysis and correction:

Exclude a known safe file from further scanning

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

You may also refer to the Knowledge Base on the F-Secure Community site for more assistance.

Also

Microsoft provides enterprise-level instructions for excluding files from scanning by antivirus software:

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more assistance.

Contact Support

F-Secure customers may request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

The PdfDropper file is usually distributed in spam email campaigns. Its appearance and content is usually designed to lure unsuspecting users into opening the file. The PDF file is specially crafted to contain and deliver a document file, which in turn has malicious macro code embedded in it.

Opening the PDF file causes JavaScript code included in it to run, which drops and opens the document file. This executes the embedded macro code, which contacts a remote server to download and run other harmful programs on the machine.

In previously analyzed samples, the downloaded programs include ransomware (Locky) and banking trojans (Dridex).

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