PDF malware analysis — malicious · cf889e3ab1a6f38e

MALICIOUS

PDF

40.0 KB

MD5: fc60bf0badd5504c248821f692848a20 SHA-1: 16f727475d85be65c07315135d72188d34cb3764 SHA-256: cf889e3ab1a6f38e446ef983e83b343378096f77897da637641ca3c1115550b4

228 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

This PDF file is flagged as malicious by ML classifiers and ClamAV (Win.Trojan.Agent-36169). It contains embedded JavaScript and exploits CVE-2009-4324 via the media.newPlayer API. The embedded JavaScript streams, particularly 'javascript_obj0008_001.js', are large and obfuscated, suggesting they are responsible for downloading and executing a secondary payload. The document body contains JavaScript code that appears to be part of the exploit chain.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
ClamAV: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36169
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.
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.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `c894b77cc94a964a4e81fec1651c15fa829fe351ea28cca658810eca2c62c23d`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2019 bytes
Detection ClamAV: Win.Trojan.Agent-36169 Obfuscation or payload: unlikely
`javascript_obj0008_001.js` `b97ea0111881bb3ef6b748e9e110ad22dcb7eda29d43b5d12c036916f6296cd0`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	40427 bytes
Detection ClamAV: Win.Trojan.Agent-36169 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `6615bafdfca3443f4e226384bdb5b622622cea29fad1cb3aad6a924ef5787e9e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x9FE	2540 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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