Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b952d07becf4d5e…

MALICIOUS

PDF

158.6 KB Created: 2008-05-27 21:06:43 -07:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0.1 (Windows))
MD5: 9b0ad545a8f3bfc2c657e6851359e634 SHA-1: b188ba90d2e76defd28525f8c5882498ce9cbd14 SHA-256: 4b952d07becf4d5e36584d56de491850c15f2a5d1ceeb84586d6d21288fd8c4e
274 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.002 Malicious Link

This PDF file contains embedded JavaScript and exploits the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript stream, identified as 'javascript_obj0025_000.js', is likely responsible for downloading and executing a secondary payload, as suggested by the 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 10

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (matched in decompressed stream)
  • 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.Exploit.Agent-35909 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35909
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PermissionError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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_obj0025_000.js
9bdbfa5df6f827ff63cd61e1f8d58420b7f4b59844725102d812651a2abe8b1e		 pdf-javascript-stream PDF /JS object 25 at offset 0x7FC 3404 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 eval/decoder/string-building token(s).
polyglot_child_pdf_off00025963.pdf
309d41738eadb418823010d219ab738245cf6d7c7439b2e1232fe86f2480c450		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x25963 8462 bytes

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