Did you just find a download or a file on your computer that has been digitally signed by POSTMEDIA Co.,Ltd? Some of the security products refers to the detected files as Trojan.Win32.Generic!BT and Win32/Adware.Agent.NPW. The detection rate for the POSTMEDIA Co.,Ltd files collected here is 39%. Please read on for more details.
You will probably notice POSTMEDIA Co.,Ltd when double-clicking to run the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view additional details from the POSTMEDIA Co.,Ltd certificate with the following steps:
Here's a screengrab of a file signed by POSTMEDIA Co.,Ltd:

As you can see in the screencap above, Windows states that "This digital signature is OK". This implies that the file has been published by POSTMEDIA Co.,Ltd and that no one has tampered with the file.
If you click the View Certificate button shown in the screengrab above, you can see 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 see the address for POSTMEDIA Co.,Ltd, such as the street name, city and country.
Thawte Code Signing CA - G2 has issued the POSTMEDIA Co.,Ltd certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the POSTMEDIA Co.,Ltd files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 22/57 | wuu_utiltop.exe |
Here's the detection names for the POSTMEDIA Co.,Ltd files. I've grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| AVG | Skodna.Generic_c.FT |
| AVware | Trojan.Win32.Generic!BT |
| AegisLab | Rkit.Agent.Gen!c |
| AhnLab-V3 | PUP/Win32.UtilTop.C864207 |
| Antiy-AVL | Trojan[Downloader]/Win32.Agent |
| Avira | RKIT/Agent.1124560 |
| DrWeb | Trojan.Adkor.45 |
| ESET-NOD32 | Win32/Adware.Agent.NPW |
| GData | Win32.Application.Agent.LAZGAW |
| Invincea | virus.win32.sality.at |
| Jiangmin | TrojanDownloader.Agent.enxf |
| Malwarebytes | Adware.KorAd |
| McAfee | Artemis!886D8F56BC18 |
| McAfee-GW-Edition | Artemis!Trojan |
| NANO-Antivirus | Trojan.Win32.Agent.csrpyt |
| Rising | Malware.Undefined!8.C-kefEYdawEnJ (cloud) |
| Symantec | Download.Adware |
| VBA32 | TrojanDownloader.Agent |
| VIPRE | Trojan.Win32.Generic!BT |
| ViRobot | Adware.Agent.1124560[h] |
| Yandex | PUA.Agent! |
| Zillya | Backdoor.DarkKomet.Win32.36984 |
The detection percentage is based on that I have collected 57 scan results for the POSTMEDIA Co.,Ltd files. 22 of these scan results came up with some sort of detection. If you like, you can view the full details of the scan reports by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: