You can download a free trial version at: https://www.adobe.com/cfusion/tdrc/index.cfm?loc=en&product=illustrator
Yes it is free of malware and spy ware. It is a trusted program, but make sure to stay up to date on Adobe patches because hackers love to put viruses on Adobe extensions.
Never Use it! A bunch of adware!
No one knows, run for your life RUN!
The only safe site to download Adobe Acrobat is from Adobe itself (see below)