In computer security, the term specially malformed is used to describe poisoned input. In theory, it means any input that was deliberately created to exceed the expectations of a normal, naive user.

In practice, it usually means that the programmer failed to account for all possible input, and someone has come up with a buffer overflow attack or something similar.

The most common specially malformed input is a long string of capital A's -- often thousands in a row. AAAAAAAAAAA... is used mostly because it leaves an obvious trail in hex; you can examine the results of your attack by looking for the repeating hex code 414141414141...

So, for example, you could use a Web browser to request the URL and see if it crashes or something.

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