Yes, aminet is infected. It attempts a drive-by attacks against windows systems via java vulnerability, at least. It likely attempts to use several attack vectors depending on the targets system: java, flash, pdf, and vulnerabilities in the browsers themselves.
Here's how you can see the initial javascript payload regardless of the platform:
curl --user-agent 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)' http://aminet.net/util/arc/lha.run | less
Modifying e(s) the end of the code to document.write(s) we can see the actual payload decoded. It opens an iframe with URL "http://
.ibiz.cc/?go=2" that'll perform the actual drive-by attack: