How can I remove malware after opening .html file on my iPhone?

Please help. I received an email which looked Legitimate as I was expecting a business payment.

I downloaded the file. Without noticing that it was . HTML rather than pdf.

the file is blank when I opened. I then realised it could be a malware. Is there anyway of checking and confirming and clearing up?

[Re-Titled by Moderator]

Original Title: i downloaded a malware file on iphone