The trojan downloader family consists of dozens of different variants. The main characteristic of these downloaders is that they hiddenly download and run executable files on a user's computer.
Many of these downloaders are compressed with different file compressors to reduce their size and to hide their contents from users' eyes.
These Trojans are typically distributed via email attachments.
This variant was distributed widely in July 2005, as fake bill from Deutsche Telekom. The filename used was rechnung.pdf.exe.