Once the user is on the landing page (which is also identified by the Exploit:JS/MagnitudeEK.G detection), they are exposed to the exploit kit, which is a toolkit used by attackers that can probe the user's computer for specific vulnerabilities in the operating system or installed programs. If any are found, the exploit kit tries to exploit it.
Once an exploit kit successfully exploits a vulnerability, it will launch its payload, which usually involves downloading and installing other malware on the affected machine. The installed malware can be any form of malicious program, but is most often a trojan, backdoor or ransomware.
The vulnerabilities leveraged by the exploit kit are usually application or platform specific; in other words, a specific program (or even a specific version of a particular program) must be installed on the machine in order for the exploit to be effective.
To prevent exploitation of such vulnerabilities, please refer to the application vendor for the latest updates and additional advice.