Update (April 9th 2013): Currently appears to be clean but there have in fact been malware in the past on this domain.
Investigated further and found out that in the past (from August 2012 to Jan 2013) there have been malware present on their site.
Dates malware was detected:
2012-09-03 (http://www.malwareblacklist.com/ and clean-mx.com))
2012-11-23 (both malware blacklist AND clean-mx.com)
Today I searched http://www.malwaredomainlist.com/mdl.php?search=cda-adc.ca and there is currently no listings for malware reports for that domain.
Posted Feburary 8th 2013:
This site belongs to the Canadian Dental Association (CDA). I have not found any problems with it personally.
Checking with multiple site safety verifiers I could not find any information pointing to any problems: