PDF malware analysis — malicious · 9be1670450d2e9cd

MALICIOUS

PDF

257.7 KB Created: 2008-04-01 04:26:13 -08:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.0)

MD5: d8628a112c2a3d911dc7bb1fa8c37007 SHA-1: d9df32f8d88f192450b4f1e1d9928abb6ca51879 SHA-256: 9be1670450d2e9cd325268eb8775f823dad5ec034c5a893cfa26a88c763bf723

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

This PDF file contains embedded JavaScript that exploits CVE-2007-5659, a known vulnerability in Adobe Reader. The JavaScript is obfuscated using the Dean Edwards packer, but static unpacking revealed the exploit trigger. The primary intent is to download and execute a second-stage payload, indicated by the ML_NYX_PDF_MALICIOUS heuristic and the presence of unpacked JavaScript streams. The benign URLs extracted are not indicative of malicious activity.

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. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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/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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `f65673802e64433b6c61416390fb190384ae05dead27379e8bacd9e1d0ee3cc7`	pdf-javascript-stream	PDF /JS object 32 at offset 0x7DD	3762 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`dean_edwards_stage_000.js` `254d298dcc5f5ca7e56f6f9777c392b85801dd4c29f2e83b3943a983d06d9002`	deobfuscated-js	Dean Edwards unpacked JavaScript (decompressed) at offset 0x813	4958 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).

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