Not sure if it even the job of a Maleficent Pumpkin Witch Mtn Busch Light Halloween shirt or web developer to detect a hacker, more likely you will have a site operator or ops team that should notice. Hacked web pages are very common, often when you get spam mails they contain links that are pointing to hacked web pages where the hacker has put new files into directories that are usually not used for the pages. Quite often these sites are WordPress sites since there are a lot of insecure addons for WordPress that would be included in the newly developed.
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Other holes can be additional tools used for a site that will open attack vectors that may stay unnoticed for Maleficent Pumpkin Witch Mtn Busch Light Halloween shirt. One rather nice example of this was a security issue in ImageMagick, an image conversion tool that is standard on Linux and is often use to scale images, convert from png to jpeg and similar things. This had a security hole that allowed a hacker to start a shell script on the local machine when a specifically constructed image file was processed (e.g. when someone uploads a file to a gallery).