First, never use any kind of "anti-virus" or "anti-malware" software on a Mac. That's how you cause problems, not how you solve them.
You may have installed a fake "utility" called "Advanced Mac Cleaner." Like any software that purports to automatically "clean up" or "speed up" a Mac, it's a scam, and some or all variants of it are ad-injection malware.
To remove it, please take the steps below. Some of the files listed may be absent in your case. Back up all data before proceeding.
Malware is always changing to get around the defenses against it. This procedure works as of now, as far as I know. It may not work in the future. Anyone finding this comment a few days or more after it was posted should look for a more recent discussion, or start a new one.
If you paid for the software with a credit card, consider reporting the charge to the bank as fraudulent.
Step 1
Triple-click anywhere in the line below on this page to select it:
~/Library/LaunchAgents
Right-click or control-click the highlighted line and select
Services ▹ Open
from the contextual menu.* A folder named "LaunchAgents" may open. If it does, look inside it for files with a name that begins like this:
com.pcv.
Move any such file to the Trash.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You may not see what you pasted because a line break is included. Press return.
Step 2
The malware is now permanently inactivated, provided that you don't reinstall it. This step is optional.
Delete the following items, if they exist, as in Step 1:
/Library/Application Support/amc
~/Library/AdvancedMacCleaner
There's no need to log out or restart after taking this step.
The problem may have started when you downloaded something, such as the application "FileZilla," from the "Sourceforge" website or some other Internet cesspit. Never visit that site again. All software should be downloaded only from the developer's website or from the Mac App Store, if applicable.
