Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9089e29a2322f9b…

MALICIOUS

PDF

449.4 KB Created: 2009-08-06 08:45:36 -03:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: dd86f56234ae4e757dfdd85b81b89141 SHA-1: dcab36ae51b6f60617033cf43d3251027b2be257 SHA-256: a9089e29a2322f9bca394db45e289c138075b96f6f1991dac0d75d845d3b1437
136 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and Flash (RichMedia) content, strongly indicating an attempt to exploit vulnerabilities or deliver malicious code. The ML classifier also flagged this PDF as malicious with high confidence. The presence of embedded files, including a secondary PDF and a JavaScript file, suggests a multi-stage attack. The primary goal appears to be the execution of arbitrary code, likely leading to the download of additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • Secondary embedded PDF body has suspicious static findings high 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.
  • 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
  • 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://adobe.com/AS3/2006/builtin
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
opening_animation.swf
917b58b57f117c208dbdbb38b9675db5d304a168912a042ce346da196cb89439		 pdf-embedded-file PDF EmbeddedFile object 29 at offset 0x567CE 1165 bytes
javascript_obj0034_000.js
64273ec2489853bda15daef0c125290188ba1ddfee3161c3b00c3888c70a4f30		 pdf-javascript-stream PDF /JS object 34 at offset 0x56F59 8192 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
polyglot_child_pdf_off0006c656.pdf
93de7b53c4b40efaaddf2289f27d26eeb6e81c5110a1f4bd8c1bc5169000bbf4		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x6C656 16191 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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