PDF malware analysis — malicious · cb29757ad7a2a27b

MALICIOUS

PDF

567.1 KB Created: 2008-03-03 17:06:00 UTC Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))

MD5: f7750d651e5bdf719e95affa66073f83 SHA-1: d0e40a46a2b609db790898b260792a2fba4c4a9f SHA-256: cb29757ad7a2a27bccb4978a0395297cef6dcfafd9e3824d78721106cf48548e

192 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF document contains embedded JavaScript that exploits known vulnerabilities in Adobe Reader, specifically CVE-2009-4324 and CVE-2007-5659. The JavaScript is heavily obfuscated using `String.fromCharCode` and is designed to be executed by the PDF reader. The primary goal appears to be the exploitation of the reader to download and execute additional malicious content, as indicated by the embedded URL http://www.pdf-repair.com.

Machine Learning

Nyx PDF Classifier malicious score 0.9897

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_obj0040_000.js` `479709d781d3e822daffb67b734746d6560150ce79b6e5e1c0a6bc6750c65f27`	pdf-javascript-stream	PDF /JS object 40 at offset 0x8BAF9	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 0x8BB1B	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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