Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce6d52db0bb7040…

MALICIOUS

PDF

130.4 KB Created: 2008-05-21 16:10:52 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))
MD5: debfca88208d1e6f85db10c11841b3c1 SHA-1: 72e188b89682e488560cabab0140eb251add0cdc SHA-256: 4ce6d52db0bb7040599c4c204b7762ce9727888ad6d0ab22473635bc9e3bf029
150 Risk Score

Malware Insights

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

This PDF file exhibits multiple high-severity heuristic firings, including the presence of embedded JavaScript and a secondary embedded PDF. The ML classifier strongly indicates maliciousness. The embedded JavaScript, identified as 'javascript_obj0031_000.js', is the primary mechanism for the attack, likely downloading and executing a second-stage payload. The presence of a secondary embedded PDF further suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • 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.
  • 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.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • 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
javascript_obj0031_000.js
d11df98c7ee948d719272ddf277381778834180ea847575920fd07d7f7341ca2		 pdf-javascript-stream PDF /JS object 31 at offset 0x20B6 3242 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 19 eval/decoder/string-building token(s).
polyglot_child_pdf_off0001d2d7.pdf
60412d2e52e35bdd0a96ce08d0261041215024a3dbe517b4f52ba3dccea5ef48		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1D2D7 14030 bytes

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