Companies House "(AR01) Annual Return received" spam

This fake Companies House spam comes with a malicious attachment.

From:     Companies House [web-filing@companies-house.gov.uk]
Date:     4 September 2014 10:58
Subject:     (AR01) Annual Return received

Thank you for completing a submission Reference # (1650722).

    (AR01) Annual Return

Your unique submission number is 1650722
Please quote this number in any communications with Companies House.

Check attachment to confirm acceptance or rejection of this filing.

All web filed documents (with the exception of downloaded accounts templates) are available to view / download for 10 days after their original submission.

Once accepted, these changes will be displayed on the public record.

Not yet filing your accounts online? See how easy it is...

For enquiries, please telephone the Service Desk on +44 (0)303 1234 500 or email enquiries@companieshouse.gov.uk

This email was sent from a notification-only email address which cannot accept incoming mail. Please do not reply directly to this message.

Attached is a malicious PDF file ar01_456746_09042014.pdf which has a VirusTotal detection rate of 5/54. The Malware Tracker report shows that this attempts to exploit the CVE-2013-2729 flaw that was patched over a year ago.. so it may well be that if your version of Acrobat is up-to-date then you will be OK, as you will probably be if you use another PDF reader.