我有一段时间谷歌Nexus 7平板电脑，我最近注意到我有文件命名为"designing for android.pdf" 的文件在"下载" 文件夹（本机OS文件夹）中。现在问题是我永远不会下载这个文件，因为我不是Android App Developer，我都没有打算迟早做任何事情。
无论如何回到它，最重要的是，只要我尝试使用，Adobe Reader，本地人（我只需要使用要打开文件的选项），而且可以使用Kingsoft Office Viewer，因此打开文件报告不同错误，如文件已损坏等。
所以这个文件是恶意吗？有人报告过任何类似于上述文件的恶意文件吗？或者操作系统本身将其分发给它是部分？
I have Google Nexus 7 tablet for some time and I recently noticed that I have file named "Designing for android.pdf" in "Download" folder (native OS folder) . Now problem is that I never downloaded this file ever, since I am not android app developer and neither I have plan to do it any sooner.
Anyways coming back to it, on top of that whenever I try to open that file using , Adobe reader, Native one (I just get the option which app to use to open the file), and Kingsoft office viewer, none can open the file reporting different errors like file is corrupted etc.
So is this file malicious? Anyone reported of any malicious file having name similar to above file? or OS itself distributes it as it's part?
如果您认为此文件不是pdf ..然后在Windows PC上将其下拉，并由记事本打开。第一行中的前几个字母将告诉您当前文件是什么格式。你可以在这里粘贴它让我们看看那是什么。
例如：
％pdf-1.6
If you think this file is not pdf.. then downlad it on windows pc and open by notepad. First few letters in first row will tell you what format is current file. You can paste it here to let us see what is that.
For example:
%PDF-1.6
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