File appears to be malicious or unsafe

Dear Team,

recently a scan led to this result.

Please let me know, if this is critical.

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Filename: wp-content/themes/enfold/functions.php
File Type: Not a core, theme, or plugin file from wordpress.org.
Details: This file appears to be installed or modified by a hacker to perform malicious activity. If you know about this file you can choose to ignore it to exclude it from future scans. The matched text in this file is: @$wp_template_css[‘style’]( null

The issue type is: Backdoor:PHP/wpoptions.10562
Description: Executes malware code hidden in wp_options table data

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Thx!

Martin