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var objVcVirtualMachineConfigInfo = objVcVirtualMachine.config;

var objVcVirtualHardware = objVcVirtualMachineConfigInfo.hardware;

var arrVcVirtualDevice = objVcVirtualHardware.device;

var strMacAddress = "";

for (var i in arrVcVirtualDevice )
{
    var objVcVirtualDevice = arrVcVirtualDevice .pop();

    if (objVcVirtualDevice )
    {
        System.debug("currentDevice: " + objVcVirtualDevice);

        if (objVcVirtualDevice instanceof VcVirtualVmxnet3)
        {
            System.debug("found network card on " + objVcVirtualDevice);

            strMacAddress =objVcVirtualDevice.macAddress;

            exit;
        }
    }
}