Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fe8448434a3467…

MALICIOUS

PDF

46.4 KB Created: 2010-02-09 11:19:09 +01:00 Authoring application: Acrobat PDFMaker 8.1 für Excel (via Acrobat Distiller 8.1.0 (Windows))
MD5: 36d22db1cc17b26fca742eb117eb149f SHA-1: 37f98a73b11aa5e1fb8d6cf4a704186a08e76789 SHA-256: 71fe8448434a3467aa727e411b1c729028e459ed3dbc56068bde9d1b2a0a8563
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that exploits CVE-2007-5659 via the Collab.collectEmailInfo function. This script is designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the exploit cluster confirms the presence of known PDF JavaScript exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • 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/pdf/1.3/
    • 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/pdfx/1.3/
    • http://www.iec.ch

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0018_000.js
96c8790c27a7048ba4634c151f9d84b0101c4a95577f628ae3b6a6e13cfe869c		 pdf-javascript-stream PDF /JS object 18 at offset 0x11DF 1380 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).
generic_stage_recovery_000.js
59598cada856ebd0d73d304c3f6e6d405983d5a0d42d0323302a7106971ec1de		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 18 at offset 0x11DF 1375 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).
icc_00_off00007c88.icc
00c36ad25cc79152e364edf8e9d58e9fd2807e6188c07a8de84826e22aab9a92		 pdf-icc-profile PDF ICC profile at offset 0x7C88 3144 bytes

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