Did you just find a download or a file on your computer that has been digitally signed by Mediaclick? Some of the security products refers to the detected files as Gen:Variant.Graftor.12501 and WS.Reputation.1. The detection rate for the Mediaclick files collected here is 9%. Please read on for more details.
You will probably notice Mediaclick when running the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the digital signature details for Mediaclick with the following steps:
Here is a screenshot of a file that has been digitally signed by Mediaclick:

As you can see in the screencap above, Windows states that "This digital signature is OK". This means that the file has been published by Mediaclick and that no one has tampered with the file.
If you click the View Certificate button shown in the screenshot above, you can view all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, and so on. You can also examine the address for Mediaclick, such as the street name, city and country.
Thawte Code Signing CA has issued the Mediaclick certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Mediaclick files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 4/43 | comm.dll |
Here's the detection names for the Mediaclick files. I have grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| BitDefender | Gen:Variant.Graftor.12501 |
| F-Secure | Gen:Variant.Graftor.12501 |
| GData | Gen:Variant.Graftor.12501 |
| Symantec | WS.Reputation.1 |
The detection percentage is based on that I've collected 43 scan results for the Mediaclick files. 4 of these scan reports came up with some sort of detection. You can view the full details of the scan results by examining the files listed above.
The analysis is done on certificates with the following serial numbers: