PDF malware analysis — malicious · 9a3f750ef9d9bfe7

MALICIOUS

PDF

289.6 KB

MD5: bfdf9c35a894c50ebb71f92137ce9a4c SHA-1: 69f9d1ee08e2b9569ee3cdd4e1516d49037703a8 SHA-256: 9a3f750ef9d9bfe7a874c35a29bb9d68240c61f71ce20e60f5299cc387f0babc

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that is obfuscated using String.fromCharCode and numeric array XOR decoding, a technique associated with CVE-2009-4324. The heuristic firings indicate that this JavaScript is designed to be executed, likely to download and execute a second-stage payload. The presence of external URIs further supports this, suggesting a download mechanism. The extracted JavaScript files, 'javascript_obj0007_000.js' and 'legacy_pdfkit_stage_000.js', are indicative of this malicious behavior.

Heuristics 7

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)
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.
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)
External URI info PDF_URI

PDF contains an external URL action
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.imagepdf.com/)/S/URI
- http://www.imagepdf.com/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b7e03d1736eb0d70c10f0aa3cb3705a7eff4b830f8551cf36fd441fe0f35ce95`	pdf-javascript-stream	PDF /JS object 7 at offset 0x130	41209 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `1aa454f8fff74021f7c146afb31d034a761ead88f42783b5dc6a3c632dc21a39`	deobfuscated-js	numeric array XOR decoded JavaScript at offset 0x130	9741 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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