False Positive of Viruse Definition: 110816-1 (Avast Pro 4.8) Urgent !!!

[ady4um]

PDF Xchange has been working for me with no problems

...with Avast v4.8? Or with v6.0?

@tlee,

If the problem was a database update, it may be solved in future updates.

In the meantime, maybe you could find a workaround, like for example using a portable PDF viewer/reader. Being portable, it should give you a simple interface without messing with your current Windows settings. When the problem would be solved in Avast databases, then you simple delete the folder of the protable PDF viewer and you continue with your usual program, PDF Xchange.

Of course, if you also need edition of PDF, that may be "more complicated" to temporarily workaround.

For portable PDF viewers, there are many options. Ask here if you are interested.

[DavidR]

PDF Xchange has been working for me with no problems

Snap, but then again I'm not using avast 4.8, though I can't see how that would be an issue as I don't think there would be a huge difference in the Malware-gen signature for avast 4.8 and avast 5/6.

[Asyn]

...I don't think there would be a huge difference in the Malware-gen signature for avast 4.8 and avast 5/6.

Well, these are still two different databases, afaik.

[DavidR]

Yes they are, but if anything the avast5/6 database would have greater generic/heuristic detection rate, which I would have though more prone to FP than 4.8. Or it may just be more accurate because of this and another reason to upgrade to avast6

[CraigB]

I wish i didn't put my old xp to rest, i could have installed 4.8 on it to see if i could replicate the problem, it was a good sacrificial test bed  

[DavidR]

You could put XP in there as a VM and install 4.8 if your of a mind to test it. Even though I have XP, I draw the line at installing avast 4.8.

[CraigB]

You could put XP in there as a VM and install 4.8 if your of a mind to test it. Even though I have XP, I draw the line at installing avast 4.8.

And im not willing to install all that into my win7's for a problem that only one person seems to have, i suspect the issue might relate to something else myself. I gave the xp to my nephew since he's interested in electronic's so he's pretty much pulled it apart now into thousand's of pieces and he'll have a ball putting it all back together again.

[ady4um]

Snap, but then again I'm not using avast 4.8, though I can't see how that would be an issue as I don't think there would be a huge difference in the Malware-gen signature for avast 4.8 and avast 5/6.

@DavidR and @craigb, the reason I ask if it was working correctly for you (craigb) with 4.8 or v6.0 is because the OP already answered before:

And all pdf file type cannnot be opened. And it is not only happened in 1 PC, other PCs which are using Avast Pro 4.8 with this false position problem.

I need to turn off Avast protection function and make opening the PDF files correctly.

As the same time, I tested it with Avast Pro 6.0 and using same virus definition. It seems no problem for opening Pdf files.
So, I think it is just caused the problem in using ver 4.8

And Asyn is correct; v4.8 is still receiving daily database updates, but they are different than for v5/6, so the interactions / consequences might (are) different.

Avast Team MUST check the database update and resolve this strange issue. "Only" one user reported this, but many more users might have the same problem. Avast is "lucky" this is being reported so quickly.

Still, there is no answer from the OP about what exactly is triggering the problem: whether the specific *program* to view PDFs, or *any* PDF viewer would trigger the same issue with this database.