Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4b4c66cb42dc80…

MALICIOUS

PDF

306.0 KB Created: 2010-06-11 11:09:09 +08:00 Authoring application: Writer (via OpenOffice.org 3.0)
MD5: 6302d3f683d5c45f4c18b9f8b176c8c1 SHA-1: aec12ce6676d087567e577587fdb7cc7f59e8f46 SHA-256: 8a4b4c66cb42dc80e81ce8c9938402dbb7e1e87a8d97f07fa4fbbfff566ecef2
166 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a RichMedia (Flash) object, indicating an attempt to exploit vulnerabilities. A critical heuristic identified a secondary embedded PDF with suspicious static findings, suggesting a multi-stage attack. The presence of multiple embedded files and the use of JavaScript's unescape() function point towards a downloader or exploit delivery mechanism. The benign URLs are likely decoys or standard PDF elements.

Heuristics 8

  • 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.
  • 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/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000372.bin
670738457013cd155af79429ddda5dedaad3bec932e5cc66d0947d872b7700fd		 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
font_00_sfnt_off0001f248.bin
537cc61f9ccea79b2fea5c0a3230b024e9de5dfec3c95e81063c6c9495ea796d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F248 52788 bytes
font_01_sfnt_off00027793.bin
e427a31347d5d2afcfde38865362624589c93665bffcaf58132efff8f0ed095a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27793 105504 bytes
font_02_sfnt_off00035fba.bin
166aab8542c83a810c4389067476d34ce87cf068ef3fcfddf6370a2ab3b7b406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35FBA 52536 bytes
font_03_sfnt_off0003bc48.bin
a5384ed614d40c80fff54646bfc0c4038e5a3b6c1bb5fb66e2a9d651eb80b198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3BC48 98960 bytes
polyglot_child_pdf_off00017b9f.pdf
11cf994571d4e5f54dbeac5f0f4c5b7c93784df9c7b86f07726c283b16198b4f		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x17B9F 216133 bytes
polyglot_child_pdf_off0004aff7.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x4AFF7 6125 bytes

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