Did you just run into a download or a file on your computer that has been digitally signed by NJStar Software Pty Ltd? If that's the case, please read on.
You'll typically see NJStar Software Pty 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 additional details from the NJStar Software Pty Ltd certificate with the following steps:
Here's a screencap of a file that has been signed by NJStar Software Pty Ltd:

As you can see in the screenshot above, the Windows OS reports that "This digital signature is OK". This implies that the file has been published by NJStar Software Pty Ltd and that no one has tampered with the file.
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, etc. You can also examine the address for NJStar Software Pty Ltd, such as the street name, city and country.
UTN-USERFirst-Object has issued the NJStar Software Pty Ltd certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the NJStar Software Pty Ltd files I've collected, thanks to the FreeFixer users.Unfortunately I don't have any scan result from VirusTotal available for the NJStar Software Pty Ltd files at the moment. The scan results will appear here as soon as a FreeFixer user uploads a file digitally signed by NJStar Software Pty Ltd.
| Detection Ratio | File Name |
|---|---|
| Not available | NJHOOK32.dll |
The analysis is based on certificates with the following serial numbers: