Malicious PDF — malware analysis report

Static analysis result for SHA-256 380c784d6d561cac…

MALICIOUS

PDF

119.0 KB Created: 2010-06-11 11:09:09 +08:00 Authoring application: Acrobat PDFMaker 7.0 for Word (via Acrobat Distiller 7.0 (Windows))
MD5: 81f31e17d97342c8f3700fdd56019972 SHA-1: 6d364c0b886aff7ebdaa679a1120f70e744c91e7 SHA-256: 380c784d6d561cac16942d6b9933d9f7277eae05cee16cc9e30fdc73915d8447
226 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF exhibits multiple high and critical heuristic firings, including the presence of JavaScript, embedded files, and a secondary embedded PDF with suspicious static findings. ClamAV detection as 'Pdf.Dropper.Agent-6040856-0' strongly indicates a dropper functionality. The embedded JavaScript and the secondary PDF are likely components of a multi-stage attack designed to download and execute further malicious content.

Heuristics 9

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Pdf.Dropper.Agent-6040856-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-6040856-0
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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)
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000372.bin
b055b742539e0498683a78bb6ddfcea37137f6fff486b722933265d163d9334f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x372 3386 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0015_00.bin
cbd11d2ce487f41cb2e696adc35306d2f3d38b7de6eab25b0e0d07f05d693f12		 pdf-objstm-decoded PDF /ObjStm 15 0 obj (inflated) 912 bytes
polyglot_child_pdf_off0001a593.pdf
63d6c7eb3dfe689928977b82a33b98881dacc943545b2ae90272544b93287106		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1A593 13975 bytes
polyglot_child_pdf_off0001c43d.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1C43D 6125 bytes

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