Malicious PDF — malware analysis report

Static analysis result for SHA-256 146e05512103692e…

MALICIOUS

PDF

87.6 KB Created: 2008-04-14 20:11:04 +08:00 Authoring application: Acrobat Web Capture 7.0
MD5: 9f5ec346e65e297cee979fee2ddd4669 SHA-1: 3e3d4bb9d0d17fe28cf271a1f667c291e3b42bba SHA-256: 146e05512103692e4bee67d31c03561870a3ea258fbcdb7b48d7e637f41f1da8
430 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that exploits CVE-2007-5659 (Collab.collectEmailInfo). The script is heavily obfuscated but is identified as a generic exploit stage. The primary purpose appears to be downloading and executing a secondary payload, as indicated by the exploit cluster and generic stage recovery heuristics. The embedded URLs are confirmed benign and do not appear to be part of the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 11

  • 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)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • 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.
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0038_000.js
93d194a7b5106dcaa9efa3d4d2c0b2828d8f0665b264c13f9ddd5c0cc32d07ec		 pdf-javascript-stream PDF /JS object 38 at offset 0xA74 3404 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 eval/decoder/string-building token(s).
generic_stage_recovery_000.js
eabaa4ca4747ed3f9974ff56f5715251b3ec146c641e07cc8360d49ed6388d2c		 deobfuscated-js generic stage recovery percent-decode from JavaScript object 38 at offset 0xA74 3402 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 eval/decoder/string-building token(s).
polyglot_child_pdf_off00013a4f.pdf
016dfe9b1084a48fa797fb786722ef3f577464db8056f7a627734775612ce828		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x13A4F 9252 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35909
Obfuscation or payload: unlikely

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