PDF malware analysis — malicious · a16d5c74b7079bea

MALICIOUS

PDF

3.42 MB Created: 2008-02-27 16:58:09 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))

MD5: f63ab6905f89374e451f4d67c8796e3d SHA-1: f9219ebe8f487ce8031e7f7850796067330e099a SHA-256: a16d5c74b7079bead1ef62f99ee8a6b2f59bb1cf136e1a6db61066042011c75f

192 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Macro: Malicious Link T1204.002 Malicious Link or Macro: Malicious Macro

This PDF file contains embedded JavaScript that leverages two critical Adobe Reader vulnerabilities: CVE-2009-4324 and CVE-2007-5659. The JavaScript is obfuscated using String.fromCharCode and is designed to exploit these flaws. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL http://www.pdf-repair.com is likely used to host or retrieve a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9290

Heuristics 9

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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)
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
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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)
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.pdf-repair.com
- 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://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://www.w3.org/1999/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0039_000.js` `479709d781d3e822daffb67b734746d6560150ce79b6e5e1c0a6bc6750c65f27`	pdf-javascript-stream	PDF /JS object 39 at offset 0x368F17	24715 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `ac1193fbfef7e653f2145890a293c08f22dc2e7a1179bb2a8723ff2ecf90307e`	deobfuscated-js	numeric char-code fromCharCode decoded JavaScript at offset 0x368F39	7513 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 25 eval/decoder/string-building token(s).

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