Malware
Pushdo
Pushdo is usually classified as a "downloader" trojan - meaning its true purpose is to download and install additional malicious software.
Pushdo is a Windows malware family.
Background
Pushdo is generally categorized as a "downloader" trojan, since its core job is to retrieve and install further malicious software. While many downloader trojan families exist, Pushdo stands out as more advanced than most, though that advancement is concentrated in its control server rather than in the trojan itself.
Source: Malpedia (Fraunhofer FKIE).