PDF垃圾邮件的新动态

    据管理服务提供商MX Logic报道，平静了数月后，一种带有PDF格式文件的垃圾邮件再次掀起小小的浪潮。回顾2007年6月至7月，发送PDF垃圾邮件是垃圾制造者备受喜爱的手段。在PDF垃圾邮件盛行的那段日子，其占据了整个互联网垃圾邮件总量的10％。

    相比于07年年中的大动荡，这次的波动是很轻微的（占垃圾邮件总量的0.5％），可问题是八月底时PDF垃圾邮件完全不存在。

    根据MX Logic风险管理负责人Sam Masiello的介绍，目前尚不清楚这次新动态的出现仅是雷达上的一小屏幕图片还是垃圾邮件制造者正再次在大范围内实行PDF垃圾邮件，但是PDF垃圾邮件总量在过去的五个月时间里近乎于零。因此从PDF格式垃圾邮件处在完全冬眠期的角度看这想必是一个有趣的发现。

（原文）

After months of almost no activity, managed service providers MX Logic reported a small wave of PDF spam emerge again. PDF spam was an extremely popular tactic for spammers back in June and July of 2007. On some of the most prevalent days PDF spam made up over 10% of overall internet spam volume.

Today's wave is relatively small (less than 0.5% of spam volume) in comparison with the penetration that they saw back in mid-2007, but PDF spam has been almost completely non-existent since it waned back in late August.

According to Sam Masiello, director of threat management at MX Logic, it is not yet clear whether this is a small blip on the radar or if spammers are looking to get back into PDF spam on a wide scale, but PDF spam volumes having been near zero for the past 5 months, so this is certainly an interesting development in a tactic that had gone completely dormant.