I got infected probably from some not official plugin or theme of wordpress.
And I see that one day after my cleaning, abou 3%of the infections of the eval(base64_decode) are appearing back after one day only...
I don't know well what it can do, but to feel safe, I would like to eardicate it definitively also because it is not moving only around my wordpress 4.5.3 websites but it is gone also probably into my vtiger crm setups, where I don't know free plugins to detect and clean the viruses too.
Please help!