To use the Malware Block List on a SpamAssassin to block e-mail messages containing URLs that point to Malware you need to perform the following simple steps:
#!/bin/sh
/usr/bin/wget -O - http://www.malware.com.br/cgi/submit?action=list_sa > /usr/share/spamassassin/10_MBL.cf
/bin/killall spamd
/usr/bin/spamd -d -u nobody