What I understand to be happening is Apple is using a very old version of the open-source ClamAV scanning engine (0.97.x) in the older versions of OS X Server, and a recent virus definition update is causing problems with these old scanning engines. Cisco/ClamAV announced that it's 0.97.x scan engines were at End of Life (EOL) effective 1 June 2016 and would no longer be supported. The announcement can be read @ClamAV 0.97 Engine End of Life Announcement

To be honest, I haven't seen a macro virus in Windows for some time. I use both Mac Office 2008 and Windows Office 2007. Of course it's not possible for a macro virus to attack Mac Office 2008 because 2008 has no support for macros. I honestly don't know how effective ClamAV is when used in OS X. You may have to purchase a better AV. For users who want to protect headless Linux-based systems such as servers, ClamAV is a perfect choice. In general, Linux-based systems are less susceptible to viruses than either Mac or Windows systems, but installing a basic antivirus is always prudent, whether you’re administering a desktop or server. Installing Malware Scanning on MacOS Install and Configure ClamAV for MacOS To enable Malware Scanning with an Acunetix installation on MacOS, you will first need to install ClamAV. Since there is no native MacOS build for ClamAV, we need to first install a mechanism to package ClamAV for installation onto MacOS.

As this fault lies somewhere between the open-source ClamAV scanner and OS X Server, I'm afraid the only people who can help with it is either Cisco (who own the open-source ClamAV software) or Apple. I would not hold my breath that either will be able to provide a solution.

These instructions are very old (2010), I have not used them personally and I have not heard from anybody recently that has, but you may be able to fix the problem by carefully following the instructions on the PDF found at Updating ClamAV on OS X Server >= 10.5.6

Oct 28, 2016 7:13 AM

ClamXav Editor's Review

ClamXav is a free antivirus solution based on the Open Source engine, ClamAV.
Even though Mac OS X is considered a secure operating system from the viruses that actively attack the system point of view, the users shouldn't enjoy the 'status quo'. The thing is, there are certain situations when a Windows virus can attack a Mac OS installation or an unwanted program can do that too in certain situations. Clamav

The antivirus isn't running as a real-time on-access scanner, so you need to scan your files manually. You have on the application's interface a drop zone where you can drag-and-drop the folder or the file you want to scan. With this program you can scan e-mail files too in order to reduce the risk of infection.
A nice setting is the possibility to set a 'Folder Sentry' list. All the folders from this list is going to be watched by ClamXav. You can enable from the same panel the possibility to scan the inserted disks or the startup setting for this application.
The scheduler is well structured and basically it can do several main jobs. The first job is the scheduled scan. The second one is the schedule update. Both jobs are working seamlessly, depending on your predefined settings.
Usually the virus database is updated daily. This thing depends on the producer though but usually you can see every day a 'Downloading daily.cvd' action within this antivirus.
Pluses: It is a free application that can keep you safe from unwanted applications.
Drawbacks / flaws:

How Good Is Clamav

Clamav Download For Windows 10

it doesn't has a real-time on-access scanner so you have to be careful with every new and suspicious item.
In conclusion: if you don't like spending a lot of money for a fancy commercial antivirus and you would like though to have the security feeling, then try this tool.

Clamav Mac Os

Clamav Windows

version reviewed: 1.0.4

Clamav No Mac