Manual:$wgAntivirusRequired/ru

Подробнее
Определяет, что в случае неудачной проверки на вирусы загрузка файла будет отклонена. A "failed" scan is one that does not complete successfully for some reason. It does not necessarily mean the file contains a virus.

If this is set to false, a failed virus scan will be ignored, as if the antivirus feature is disabled.