Softpedia now includes Mac malware with its downloads, Genio in this case. If you really want Matilde, just trash any other dmg that come down with it. Do not install weird unknown things!
The malware is named installjdownloader,dmg, lately - and I am sorry to see this cool little app abandoned. Maybe MacUpdate should de-list it, along with anything else that links to Softpedia. The site is listed as Unsafe.