How to resolve this issue
- Delete the unwanted iframe tag and upload
- Scan your server with antivirus and antispyware
- Must check CHMOD in Linux or write permission in windows server (Write permission is very dangerous ).
- Apply some security patches specially for PHP, mySQL
- Set PHP global_variables = off, SESSION_VARIABLES=off
- To ‘On’ the above parameters use php.ini in the root directory of your www root folder