Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e40843af3415f9…

MALICIOUS

PDF

27.9 KB Created: 2010-06-19 23:46:31 +02:00 Authoring application: Writer (via OpenOffice.org 3.2)
MD5: 90782b5e5aa34702f48d37c90bcce18e SHA-1: 38dde266ca8e75d30d4967bd657702ee553351ee SHA-256: 75e40843af3415f9ff1ea8573147750c1d42e78aecdfcd39e3f4d6d2d4872d8d
484 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information T1027 Obfuscated Files or Information T1204 User Execution

The PDF file contains embedded JavaScript and a Windows executable payload, masquerading as 'test1.pdf'. Critical heuristics indicate a launch action targeting 'cmd.exe' with parameters designed to execute the embedded payload, exploiting CVE-2010-1240. The embedded executable was detected by ClamAV as 'Win.Trojan.Rozena-131', and the PDF itself as 'Pdf.Tool.Agent-1388586'. The primary attack vector involves tricking the user into opening the PDF, which then executes the embedded malware.

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\\test1.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
test1.pdf
f93b6bd1e7d525c5f3a812c9fa108abd3beebff4f009c88cdd2e1bcb9761fbb8		 pdf-embedded-file PDF EmbeddedFile object 17 at offset 0x1E40 37888 bytes
Detection
ClamAV: Win.Trojan.Rozena-131
Obfuscation or payload: unlikely
javascript_obj0018_000.js
3ec0515f7faa4e200cbc6a13221e52386623a68363dd069a0be5c9cba4b9fdf4		 pdf-javascript-stream PDF /JS object 18 at offset 0x6B70 54 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.