Viruses Disguise As PDF Documents To Steal Information

< p > > a href= "http://www.91se91.com/news/index_c.asp" > PDF < /a > the e-book produced by the document has the impression and reading effect of the printed book. It is a commonly used reading file format for many readers.

Recently, however, a reporter has learned that a virus variant hidden in the PDF document is the first to appear in the country. If users click on it, they will activate the virus, causing users to steal their computer and cell phone information.

< /p >

< p > "open the mailbox and see a compressed file. After decompression, it contains an PDF document."

Mr. Wang told reporters that he opened it out of curiosity, but found nothing contained in it.

< /p >

< p > "at that time I realized that I might have been poisoned, and then I scanned many viruses with anti-virus software."

Mr. Wang said she tried a lot of antivirus software, but two of them were < a href= "http://www.91se91.com/news/index_c.asp" > virus < /a > always can not be deleted.

< /p >

< p > "this kind of virus is spread through the form of mail attachments, so that users can decompress and click on the PDF documents."

Mr. Liu, who is engaged in software development, told reporters that the concealed PDF virus may not display any contents or be unable to browse after opening.

< /p >

< p > notwithstanding, the user's < a href= "http://www.91se91.com/news/index_c.asp" > Computer < /a > may have been attacked by special viruses.

"Now there are many kinds of viruses that rely on office documents such as PDF and EXCEL. Users are likely to open them out of curiosity."

< /p >

< p > Mr. Liu reminded the public that the virus with a strong concealment will tamper with the user's settings and even steal the privacy information of computers and mobile phones. If you don't know the PDF documents from unknown sources, do not download and click them at will.

< /p >

< p > related links: < /p >

< p > search engines such as Solr are not equal to database storage. Index is very important. If you forget this point, you will only take the search index as memory, which will create some risks: < /p >

< p > data missing.

Although Solr does adopt some technologies that preserve data integrity, ensuring data persistence is not the strength of these systems after all.

< /p >

< p > because of streaming media data search such as Gwittr, search specific storage will develop rapidly.

If you are using SaaS, that means it is necessary to store data in Solr or memory.

< /p >

< p > loss of agility.

It is inevitable to rebuild indexes to support new functions. If you are not prepared for this, you will lose agility.

< /p >

< p > optimizing #1 regards search index as a resource that can be processed and rebuilt easily, because when you need to introduce new features, applications need to rebuild indexes frequently and in large scale.

< /p >

The P > determines that all fields in the architecture are not stored by default, which is sufficient to use common functions.

In general, you don't need to store document fields in Solr unless you want to use the highlighted functions, because Solr needs to use the initial text in the document when using some highlight functions.

You also want to store more things, such as document identifiers, because in the application code, you may use the document identifier to link the search results back to memory.

< /p >

< p > Solr also provides a set of extended field index options to help you further simplify the indexing process.

< /p >