Malicious PDF — malware analysis report

Static analysis result for SHA-256 15af03b0d46a2253…

MALICIOUS

PDF

7.7 KB Created: 2008-04-28 12:17:40 +03:00
MD5: be604eece7f746ce45cc694b93f9ea03 SHA-1: 1b5eb5a0edecb0e847b976dd784d970433b0bfc6 SHA-256: 15af03b0d46a22535f077779e4a0ef6555b1a13a8b59d3b02c9804ae013b540a
278 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 leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) and uses unescape() for obfuscation. This JavaScript is designed to execute shellcode, as indicated by the ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact. The primary function of this script appears to be downloading and executing a second-stage payload, which is a common technique for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 9

  • 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.
  • 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.
  • 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
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0010_000.js
9f4f70f7185eca6cd5b43be3cda074af16e694216c778df88870b6f34ce1c71f		 pdf-javascript-stream PDF /JS object 10 at offset 0x8C4 1914 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
javascript_obj0010_001.js
10e3907522f4d2c3dae0866d2195e5228029f86c022f740a6c8e098f32305d6d		 pdf-javascript-stream PDF /JS object 10 at offset 0x8E6 5574 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
combined_document_js_000.js
c732791ed778c2158de541516f1ce62aa22c8527526c67a1acc97e2ab20598e1		 deobfuscated-js combined document JavaScript streams at offset 0x8C4 7489 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).

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