HTML is the current platform identifier used by F-Secure to identify documents written in Hypertext Markup Language (HTML) and containing a malicious iframe.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.
The platform designator 'HTML' is used specifically to identify HTML documents which contain a malicious iframe element that cannot be classed as JS, PHP or any other script.
Examples of HTML malware include: