Did you just find a download or a file on your computer that has a digital signature from Jia Lu? Some of the security products refers to the detected files as PUP/Uncheckit and malicious_confidence_65% (D). The detection rate for the Jia Lu files collected here is 7%. Please read on for more details.
You will typically see Jia Lu 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 the additional details from the Jia Lu digital signature with the following steps:
Here is a screenshot of a file digitally signed by Jia Lu:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This means that the file has been published by Jia Lu and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot 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, etc. You can also examine the address for Jia Lu, such as the street name, city and country.
thawte SHA256 Code Signing CA has issued the Jia Lu certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Jia Lu files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 3/57 | UvConverter.exe |
| 5/57 | UvConverter.exe |
Here's the detection names for the Jia Lu files. I have grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| CrowdStrike | malicious_confidence_68% (D), malicious_confidence_65% (D) |
| DrWeb | Adware.Mutabaha.2124 |
| Invincea | virus.win32.parite.b, generic.a |
| Jiangmin | Win32/Virut.bt |
| Panda | PUP/Uncheckit |
The detection percentage is based on the fact that I have gathered 114 scan results for the Jia Lu files. 8 of these scan reports came up with some sort of detection. You can review the full details of the scan results by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: