The attached text file is a data URI (base64 encoded) with a fake malware page; unfortunately, that won't tell us what we need to block the attack site that delivered it.

Notably, in the markup there are a few references to resources hosted by http://asp.nightingalesg.top/, which may or may not be a willing participant in the scam.

Somewhat related to  issue #594215  which would make attacks by data URIs harder.

As pointed out in comment 1, I don't think there's anything actionable here.

If you know the site that this was hosted on, you can consider reporting it at https://www.google.com/safebrowsing/report_badware/