Did you just stumble upon a download or a file on your computer that has been digitally signed by Shanghai Digital Century Network Co.,Ltd.? Some of the security products refers to the detected files as Packed/PECompact and Backdoor.AAV. The detection rate for the Shanghai Digital Century Network Co.,Ltd. files collected here is 4%. Please read on for more details.
You will probably see Shanghai Digital Century Network Co.,Ltd. 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 Shanghai Digital Century Network Co.,Ltd. with the following steps:
Here's a screengrab of a file digitally signed by Shanghai Digital Century Network Co.,Ltd.:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This implies that the file has been published by Shanghai Digital Century Network Co.,Ltd. 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, etc. You can also see the address for Shanghai Digital Century Network Co.,Ltd., such as the street name, city and country.
VeriSign Class 3 Code Signing 2010 CA has issued the Shanghai Digital Century Network 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 Shanghai Digital Century Network Co.,Ltd. files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 2/48 | xfacc.exe |
Here's the detection names for the Shanghai Digital Century Network Co.,Ltd. files. I have grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| Agnitum | Packed/PECompact |
| Norman | Backdoor.AAV |
The detection percentage is based on that I have gathered 48 scan results for the Shanghai Digital Century Network Co.,Ltd. files. 2 of these scan reports came up with some sort of detection. You can view the full details of the scan reports by examining the files listed above.
The analysis is based on certificates with the following serial numbers: