The classification at that link is easy enough, if you look for it, they say:

EMD - sites engaged in malware distribution This classification is assigned to website's engaged in the distribution of malware (e.g. adware, spyware, trojans and viruses etc).

Sites with this classification typically either contain files (e.g. cracks, keygens, adware, spyware, trojans, viruses et al) or lead to such via (for example) “fake scanners” or other social engineering and misleading tactics. This includes the activities of rogue Internet Service Providers (ISPs) that host other sites to which the EMD classification applies.

So depending who uploads what there, you could run certain risks downloading certain files there,

polonus