Did you just run into a download or a file on your computer that is digitally signed by ZAXAR LTD? Some of the security products refers to the detected files as Application.Agent.AST and not-a-virus:Downloader.Win32.ZxrLoader.el. The detection rate for the ZAXAR LTD files collected here is 36%. Please read on for more details.
You will probably notice ZAXAR 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 the additional details from the ZAXAR LTD digital signature with the following steps:
Here is a screengrab of a file signed by ZAXAR LTD:

As you can see in the screencap above, the Windows OS reports that "This digital signature is OK". This implies that the file has been published by ZAXAR 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, etc. You can also view the address for ZAXAR LTD, such as the street name, city and country.
Symantec Class 3 SHA256 Code Signing CA and VeriSign Class 3 Code Signing 2010 CA has issued the ZAXAR 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 ZAXAR LTD files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 22/55 | ZaxarLoader.exe |
| 9/56 | ZaxarGameBrowser.exe |
| 21/56 | ZaxarLoader.exe |
| 14/62 | ZaxarGameBrowser.exe |
| 41/66 | ZaxarLoader.exe |
Here's the detection names for the ZAXAR LTD files. I have grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| AVware | Trojan.Win32.Generic!BT, ZaxarGames |
| Ad-Aware | Application.Agent.AST |
| AegisLab | Virus.A32.Gen!c, Gen.Variant.Strictor!c |
| AhnLab-V3 | PUP/Win32.ZxrLoader.C1929369 |
| Antiy-AVL | RiskWare[Downloader]/Win32.ZxrLoader.el, RiskWare[Downloader]/Win32.ZxrLoader |
| Arcabit | Application.Agent.AST |
| Avast | Win32:Adware-gen [Adw] |
| Avira | ADWARE/Zaxar.bwd, ADWARE/Adware.xgajz |
| Baidu | Win32.Trojan.WisdomEyes.16070401.9500.9954 |
| Baidu-International | PUA.Win32.ZaxarGames.D |
| BitDefender | Application.Agent.AST |
| Bkav | W32.HfsAdware.47B3 |
| CAT-QuickHeal | Downloader.ZxrLoader, Trojan.Zxrloader |
| Comodo | ApplicUnwnt, ApplicUnwnt.UnclassifiedMalware, .UnclassifiedMalware |
| CrowdStrike | malicious_confidence_65% (D) |
| Cylance | Unsafe |
| Cyren | W32/Trojan.PCDL-7595, W32/ZxrLoader.B.gen!Eldorado |
| DrWeb | Adware.Zaxar.86, Adware.Zaxar.62, Trojan.DownLoader11.8840 |
| ESET-NOD32 | a variant of Win32/ZaxarGames.N potentially unwanted, a variant of Win32/ZaxarGames.B potentially unwanted, a variant of Win32/ZaxarGames.P potentially unwanted |
| Emsisoft | Application.Agent.AST (B) |
| Endgame | malicious (high confidence) |
| F-Prot | W32/ZxrLoader.B.gen!Eldorado |
| F-Secure | Application.Agent.AST |
| Fortinet | Riskware/ZaxarGames, Riskware/ZxrLoader |
| GData | Win32.Application.Agent.OB1PZ4, Application.Agent.AST |
| Jiangmin | Downloader.ZxrLoader.g, Downloader.ZxrLoader.f, Downloader.ZxrLoader.w, Downloader.ZxrLoader.ac |
| K7AntiVirus | Adware ( 004f308b1 ), Adware ( 00511f641 ) |
| K7GW | Adware ( 004f308b1 ), Adware ( 00511f641 ) |
| Kaspersky | not-a-virus:Downloader.Win32.ZxrLoader.el |
| MAX | malware (ai score=72) |
| Malwarebytes | PUP.Optional.Zaxar, Trojan.Downloader |
| McAfee | GenericRXAV-LC!617C75A749DD, Artemis!35180B1B2B19, Artemis!46B69FA81050, Artemis!C38663C34824 |
| McAfee-GW-Edition | GenericRXAV-LC!617C75A749DD, Artemis!PUP, Artemis |
| MicroWorld-eScan | Application.Agent.AST |
| Microsoft | PUA:Win32/Zaxar |
| NANO-Antivirus | Trojan.Win32.ZxrLoader.eknccb, Trojan.Win32.ZxrLoader.ekgsfd, Trojan.Win32.DownLoader11.dgfcqr, Trojan.Win32.ZxrLoader.enuunr |
| Paloalto | generic.ml |
| Panda | PUP/Zaxar |
| Rising | Malware.Heuristic!ET-w6oGgilNJtP (cloud) |
| SUPERAntiSpyware | Trojan.Agent/Gen-Downloader |
| Sophos | Zaxar (PUA), Generic PUA LP (PUA), Generic PUA KP (PUA) |
| Symantec | Trojan.Gen.2, SecurityRisk.gen1 |
| TrendMicro | TROJ_GEN.R047C0OE816 |
| TrendMicro-HouseCall | TROJ_GEN.R061H0CEF18 |
| VBA32 | suspected of Trojan.Downloader.gen.h, Downloader.ZxrLoader |
| VIPRE | Trojan.Win32.Generic!BT, ZaxarGames (not malicious) |
| ViRobot | Adware.Zaxargames.209824[h], Adware.Zaxargames.206120[h] |
| Webroot | W32.Downloader.Gen |
| Yandex | Riskware.Agent!, PUA.Downloader! |
| Zillya | Adware.ZaxarCRTD.Win32.1500 |
| ZoneAlarm | not-a-virus:Downloader.Win32.ZxrLoader.el |
The detection percentage is based on that I've collected 295 scan reports for the ZAXAR LTD files. 107 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 is done on certificates with the following serial numbers: