Portable Document format (PDF) files have increasingly been used as a means to deliver spammers' advertisements, but only rarely has the file format been used as an attack vector.

PD F文件已被越来越多地用来作为一种手段来运送垃圾邮件广告，但只有少数的文件格式被用来作为一个攻击向量。

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Portable Document format (PDF) files have increasingly been used as a means to deliver spammers' advertisements, but only rarely has the file format been used as an attack vector.

PD F文件已被越来越多地用来作为一种手段来运送垃圾邮件广告，但只有少数的文件格式被用来作为一个攻击向量。

youdao