I have also had problems with the daemon.
Have you considered Mcafee, Eset, or one of the others for server protection?
Also a scan won't stop a script being added. See:
https://laracasts.com/discuss/channels/general-discussion/image-security
I suggest viewing those Symfony videos. Also I have seen where python scripts are slipped through. In fact I am still researching this.
Another good post is https://laracasts.com/discuss/channels/laravel/generate-unique-name-for-file-upload
But all of this is just for your FYI.