Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1969e4c4c94ecb…

MALICIOUS

PDF

349.5 KB Created: 2008-12-17 16:25:52 -03:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0 (Windows))
MD5: db977322cbd2327d48ad75874cf0736f SHA-1: b104f62c66fb6ca6e32a6e5425eed7fe632a81fd SHA-256: 7c1969e4c4c94ecb67a5165bd8f9702ad05df34a2a95bb9400f2792ddf62dc28
516 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript that utilizes the `exportDataObject` function to launch an embedded executable disguised as 'derechosHumanos.pdf'. This executable is detected by ClamAV as 'Win.Exploit.Countdown-1'. The PDF also contains a launch action targeting 'cmd.exe' with parameters that suggest it will execute the dropped payload, indicating a clear exploitation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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\\derechosHumanos.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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://www.apache.org/
    • http://www.iec.ch

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
derechosHumanos.pdf
84ebe00143be401ae6fe532396cc5d561f2eff07cdb834efd53aefa6bae2803f		 pdf-embedded-file PDF EmbeddedFile object 80 at offset 0x4C425 73802 bytes
Detection
ClamAV: Win.Exploit.Countdown-1
Obfuscation or payload: unlikely
javascript_obj0081_000.js
8e648ea5c92e0cd51122382918d0e35a1735e76a85017a80d5fdbaca93b1e437		 pdf-javascript-stream PDF /JS object 81 at offset 0x5718B 64 bytes
stream_007_off000085aa.bin
3c71740403f3921989b293b9864095e9028104296267f15b775a891374aaf992		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x85AA 243516 bytes
icc_00_off00000cb6.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0xCB6 3144 bytes

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