Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f09ffed86ac603…

MALICIOUS

PDF

66.4 KB Created: 2011-04-23 13:03:39 +02:00 Authoring application: Impress (via OpenOffice.org 3.2)
MD5: 1453aa35794e5eb9b5290e522f8768ab SHA-1: 30018b79ade5b498b5f7fe9e74cd105636945910 SHA-256: f3f09ffed86ac6031129524e8b07edb6473e6cab2640df671370d59fe4199639
454 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 User Execution T1059.003 Windows Command Shell

The PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute a command. Critically, it also embeds a Windows executable disguised as 'truetype.pdf'. This executable payload, combined with the CVE-2010-1240 exploit targeting Adobe Reader's launch action, strongly suggests a delivery mechanism for a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • 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\\truetype.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
  • /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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
truetype.pdf
37121ecb7c1e112b735bd21b0dfe3e526352ecb98c434c5f40e6a2a582380cdd		 pdf-embedded-file PDF EmbeddedFile object 24 at offset 0x3EFE 114688 bytes
javascript_obj0025_000.js
a3e6a8fbca367d9bc2b027c19a94ab8841292ca3f2a714418b34894179189bac		 pdf-javascript-stream PDF /JS object 25 at offset 0x105A2 57 bytes
font_00_sfnt_off00002936.bin
aca7dd4827f919b60845509905de5fd45f49d03ca215261183ae2c447fa4f567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2936 5716 bytes

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