这是 Unicode 规范中专为定义表情符号、旗帜等符号而保留的特殊字符范围。攻击者利用其中与美式英文字母表一一对应的隐形码位， 将恶意函数和攻击载荷编码为肉眼不可见的 Unicode 字符 ，选择性地插入代码的关键位置。

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