PDF malware analysis — malicious · fc021c52ad04d7af

MALICIOUS

PDF

2.3 KB

MD5: 1b02e2c91ba1f2390dcb23adfaf227a9 SHA-1: 9f0605da9ce51b124c13cc1b6463d4ce4c1008fe SHA-256: fc021c52ad04d7af565f623baad7e068885314001bb355220e5f8bf00cf50776

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF document contains embedded JavaScript that is heavily obfuscated using eval() and unescape() functions, along with String.fromCharCode. Heuristics indicate this JavaScript is designed to exploit CVE-2009-4324. The deobfuscated JavaScript, identified as Js.Exploit.Shellcode-18 by ClamAV, likely downloads and executes a second-stage payload. The specific exploit and obfuscation techniques point to a malicious PDF designed for initial payload delivery.

Heuristics 8

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)
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `e7d1232c16a6e584ebcad6ed89ed39659361935894de0b1df6aee2e4fe16ce04`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x81D	478 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `c24fb7f72b0a9e39d1563f69446fa6127208d9dc77e55464c9c8416a3d401520`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2421 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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