Text string that crashes text editors

I've seen in some youtube videos of people doing malware analysis that some hackers put at the end of their source code a string of characters that is not interpretable by text editors, and the only way to get the content of the file is to remove from the terminal the last line of the file and then open it.

Could someone tell me where to find this string and explain me why this happens? (I suppose it's because the characters inside are not interpretable, but it seems quite strange since it reminds me the iphone bug)

submitted by /u/Jefry99
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from hacking: security in practice https://ift.tt/3AcImiH

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