There is a vulnerability in the 2.8.5, 2.8.6 downloadable versions of OpenX that can result in a server running the downloaded version of OpenX being compromised. A remote attacker could use this functionality to upload and execute executable files on the system. To test this vulnerability, Acunetix created a file named testing_test on the server. You will need to delete this file.
It is recommended to update to OpenX version 2.8.7 or to delete the following file from the OpenX installation [openx_dir]/www/admin/plugins/videoReport/lib/ofc2/ofc_upload_image.php