Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdfdb88f9af79da…

MALICIOUS

PDF

86.1 KB Created: 2009-06-05 22:59:54 +02:00
MD5: 132700c1e0cea59ae0ba04ebe5bee149 SHA-1: 38784f3a4f3dfb1c08c8ad04ee1950d1e8546ddc SHA-256: dbdfdb88f9af79da47392d424b4256114854728d8ab99d8339d57db3325d7f26
206 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and a Windows executable payload, indicating a multi-stage attack. The embedded executable was detected by ClamAV as Win.Worm.FunnyPics-1. The JavaScript action likely facilitates the execution of the embedded payload or downloads additional malicious content from the identified external URI.

Machine Learning

  • Nyx PDF Classifier clean score 0.0134

Heuristics 8

  • 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.
  • ClamAV: Win.Worm.FunnyPics-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Worm.FunnyPics-1
  • 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.
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000594.js
e1c9c9bbe45104249a04cff2f9c240c38750d84a873e13178e79f0625ad6cd29		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x594 9888 bytes
stream_030_off000130e2.bin
644c7b91275e00ba78b3e543890579464f8cd229b3a403768dbc42ddaee96631		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x130E2 14316 bytes
Detection
ClamAV: Win.Worm.FunnyPics-1
Obfuscation or payload: unlikely

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