You can create one yourself.
You will need an external drive that is large enough to fit the macOS on it plus whatever program(s) you want to install to use...a USB 2.0 hard drive or flash drive would likely be your best option as it will work with the most Macs. Then using the latest macOS Sierra installer from the Mac App Store and install macOS Sierra on it. This drive will now be bootable from any Mac that can run Sierra. You can then have whatever anti-virus/malware program(s) on it. The macOS has all the drivers for any supported Mac included, unlike Windows (because there are way to many Windows hardware variations for Microsoft to do that, but a much, much smaller number of actual Apple Mac variations).
You might need to create another version or two with older versions of the macOS for older Macs that cannot run Sierra (aka 10.12.x).
You will have a tough time finding something as it would require who ever offers it to also get a license for the macOS from Apple that they can then in effect resell to end users. The only way around that is to use another OS on the bootable media (which is likely what your Windows toolset does), but I am not aware of any such options for the Mac (I believe booting a Mac to another OS also requires "adjusting" the firmware/boot process of the Mac, which is what Bootcamp does for booting to Windows on a Mac). And then you would need an anti-virus/malware program that can run on that other OS but still read macOS formatted disks and scan for Mac related malware/viruses...again not aware of anything like that (which makes sense...the Mac is a much smaller market with way few known viruses/malware...plus you can easily create an external bootable drive yourself with the macOS on it that can run Mac anti-virus/malware programs, which is something much tougher to do on Windows).
Edited by smax013, 30 January 2017 - 01:27 PM.