Strange app preinstalled on asus ME173X

Hi guys, two years ago I bought a tablet to my brother as a birthday gift. the tablet in question bought it to MediaWorld. of course I kept it for a few days with me to see if it worked and had no problems. Today my brother came to me to signal me a system app rather strange. The app is called pornclub; I can not open it and uninstall it, I can just turn it off. the only problem is that two years ago, this app was not installed on the tablet. can you tell me if it is a malware? and if it is a virus, you know you tell me how to remove it? thank you all!!