Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1a8fe213f6bce5…

MALICIOUS

PDF

425.5 KB Created: 2011-07-21 14:19:36 Authoring application: Microsoft® Office Word 2007
MD5: bab56d94ff845995d9e19d2f91cd9746 SHA-1: 6649d9c5e7db47ee394aab1445a2660f86cfb451 SHA-256: 6c1a8fe213f6bce56033b26313517a8cc43b553c7d48af325ad0842a088d8df9
516 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript that triggers a launch action for cmd.exe, exploiting CVE-2010-1240. This action is designed to execute a dropped payload, identified as a Windows executable disguised as 'crono1p.pdf'. The embedded executable was detected by ClamAV as Win.Trojan.Swrort-5710536-0, indicating a trojan downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 12

  • Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240
    PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: cmd.exe is invoked with attacker-controlled parameters, paired with an embedded/exported payload.
  • Launch action critical PDF_LAUNCH
    PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • /Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\crono1p.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH
    An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • /Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS
    PDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.zeustech.net/
    • http://]hostname[:port]/path
    • http://www.apache.org/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
crono1p.pdf
d3db0268a5ccf375a4d9ad8b7114a18b9a35dc6f072447bea71d405158a928a1		 pdf-embedded-file PDF EmbeddedFile object 3542 at offset 0x5F467 73802 bytes
Detection
ClamAV: Win.Trojan.Swrort-5710536-0
Obfuscation or payload: unlikely
javascript_obj3543_000.js
6315c161bdcbb40e620936585c46efff48f8b9ad485738715a50a077bcaa8e1b		 pdf-javascript-stream PDF /JS object 3543 at offset 0x6A0E1 56 bytes

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