Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0bfc7fa7ca589d…

MALICIOUS

PDF

5.4 KB Created: 8952-67-92 14:81:19 -39:29 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 6752d4954f0216e4d72d37cdc929909b SHA-1: fca7e11cde3ca5b9571f4221222e1ef11af73dbc SHA-256: 0a0bfc7fa7ca589d32614b24cd5e0887296f34c69d533738d8bc0d97fe6f26aa
332 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 JavaScript is heavily obfuscated but is flagged as an exploit cluster and a dropper. ClamAV detections confirm this is a malicious PDF dropper, likely designed to download and execute a secondary payload. The extracted JavaScript streams are too truncated to reconstruct specific URLs or commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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)
  • 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: Pdf.Dropper.Agent-7226707-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7226707-0
  • 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)
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. 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/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_obj0028_000.js
8ad9775515e87c98f8f01c2520e0b67d4a94587faf6ba896b413bdd92063cd6e		 pdf-javascript-stream PDF /JS object 28 at offset 0x50C 3530 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
javascript_obj0028_001.js
9524620ceb30e1f58a379357fba7402174d8b101b67a2e956f8ed5071eca70d3		 pdf-javascript-stream PDF /JS object 28 at offset 0x540 3484 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
b749b820b5b38536ee4c92db16e5767189d7bcba4c4a54990fe607893f262dc7		 deobfuscated-js combined document JavaScript streams at offset 0x50C 7015 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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