PDF malware analysis — malicious · e5be8482bbef70e6

MALICIOUS

PDF

3.0 KB

MD5: 53b4f740b142471188c90d4d7bd88a74 SHA-1: 0a56d91766dc3bf6808fea51755d5da0a1513dc4 SHA-256: e5be8482bbef70e687dcfe6de27130729b95838915c0dbd18d5460c195199c3b

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2009_4324 heuristic firing points to the exploitation of a known PDF vulnerability using a numeric character-code string to decode and execute JavaScript. The PDF_EVAL and PDF_FROMCHARCODE firings further confirm the use of JavaScript evaluation and string manipulation. The extracted JavaScript streams, particularly 'numeric_charcode_stage_000.js', are likely responsible for downloading and executing a second-stage payload, although the exact URL or payload could not be determined from the provided evidence.

Heuristics 6

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `02093eeadaf0e1bfc6a211eb0fc43e81c389e72cc7171e453e8037b4d4722e91`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	12310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `2246af5c80e5dd88cff0883258e5d822f7acc57bf781998e0c6e55f742a048e2`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	3574 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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