Malicious PDF — malware analysis report

Static analysis result for SHA-256 56622cac8bac1920…

MALICIOUS

PDF

57.9 KB Created: 2010-09-14 14:30:10 +03:00 Authoring application: Writer (via OpenOffice.org 3.1)
MD5: b559822cb84da2dbc8de73ed87dc2d1e SHA-1: cfae6e4e3eea5cdcb1c351ee7832fe36b236902c SHA-256: 56622cac8bac19206aae18d46e99948f52a49d1244eccc199376431e69777e47
484 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1204.002 Malicious File Execution: User Execution T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary commands. Crucially, it also embeds a Windows executable disguised as 'Statement.pdf', which is detected by ClamAV as Win.Trojan.Swrort-5710536-0. This chain of actions, specifically the CVE-2010-1240 exploit, is designed to trick the user into opening a malicious executable disguised as a document.

Heuristics 11

  • 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\\Statement.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
Statement.pdf
4a216ffd78c1e7d7fcf830f8ebf9256673606985b5964c11d7e1140a3dcb1280		 pdf-embedded-file PDF EmbeddedFile object 17 at offset 0x3775 73802 bytes
Detection
ClamAV: Win.Trojan.Swrort-5710536-0
Obfuscation or payload: unlikely
javascript_obj0018_000.js
742a6fd743e7d803e37554e868b8d5cfe3de66a91ee0c10fe77acaef98d0b460		 pdf-javascript-stream PDF /JS object 18 at offset 0xE37D 58 bytes

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