Suspicious codes threaten security?

Hi

Today my security program reports several suspicious codes in the theme Generate Press Premium plugin.

It was reported as high risk:

/gp-premium/hooks/functions/hooks.php
Suspicious code instructions found

Line 22: eval
May be used to execute malicious code on the web server. Pairing with base64_decode function indicates malicious code.

Line 30: add_action
Line 38: add_action
Line 46: add_action
Line 54: add_action
Line 62: add_action
Line 70: add_action
Line 78: add_action
Line 86: add_action
Line 94: add_action
Line 102: add_action
Line 110: add_action
Line 118: add_action
Line 126: add_action
Line 134: add_action
Line 142: add_action
Line 150: add_action
Line 158: add_action
Line 166: add_action

/gp-premium/site-library/classes/class-site-import-impage.php:
Suspicious code instructions found

Line ?: FROM
Line ?: WHERE
Line ?: FROM
Line ?: WHERE
Execute arbitrary command on the web server (BCTK)

/gp-premium/elements/class-hooks.php:
Suspicious code instructions found

Line 192: add_filter
Can alter any website data or website settings

Line 195: add_action
Line 215: eval
May be used to execute malicious code on the web server. Pairing with base64_decode function indicates malicious code.

I am not a technician and need a simple solution.

Should I delete the php files? If so, it will destroy the layout, right?

I assumed Generate Press Premium is clean?

Thanks a lot for your help

Manuela