Did you just find a file that has been digitally signed by Portforward, LLC? If that's the case, please read on.
You will probably notice Portforward, LLC when clicking to run the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the digital signature details for Portforward, LLC with the following steps:
Here's a screencap of a file that has been digitally signed by Portforward, LLC:

As you can see in the screenshot above, Windows reports that "This digital signature is OK". This implies that the file has been published by Portforward, LLC and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can examine 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 Portforward, LLC, such as the street name, city and country.
COMODO Code Signing CA 2 and COMODO RSA Code Signing CA has issued the Portforward, LLC certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Portforward, LLC files I have gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/55 | PortForwardNetwork_2075E11166E645FCA45A38FBF157B6E1.exe |
| 0/59 | NewShortcut1_11DD976601A04CBBB38A83FAAEABD198.exe |
| 0/67 | PortForwardNetworkUtilities.exe |
The detection percentage is based on the fact that I have gathered 181 scan results for the Portforward, LLC files. 0 of these scan results came up with some sort of detection. If you like, you can review the full details of the scan reports by examining the files listed above.
The analysis is based on certificates with the following serial numbers: