一个恶意的js是自动注入到我的头。php文件和其他许多js文件?

Currently I am facing a hell like situation, four of my client websites were hacked before 10 days. I messed up a lot with them and three of them are working fine(running magento) after my long mess up with them, but one of them(running word press) is still facing the same situation and I could not figure out what was going on, after a particular timing the js files and some php files too are auto injecting with this kind of code : Currently I am facing a hell like situation, fo