Fix: Google Ads Disapproved Malicious Software

Malicious content or malware refers to software or mobile applications specifically designed to harm computers, mobile devices, the software they run, or their users.

This is posted in the Google Ads section, so I assume it refers to Google Ads account suspensions in which the suspension reason shows as due to malicious software, etc. In most such cases, it is due to some coding / hidden coding in the template of the landing page. So, experiment to know about that, by using a simple light template.
In reality there may not be anything malicious, but Google Ads would detect some coding / hidden coding as malicious, so do your experimentations accordingly to narrow down on it.
Sometimes it can also be due to coding / hidden coding in addons in the landing page.