PDF malware analysis — malicious · 1bc64d6c20b054ad

MALICIOUS

PDF

1.4 KB

MD5: 456b07471a5c5c866b2d3fb4c32b0e3a SHA-1: f3f98480e049f71700aed0c71e93116637332877 SHA-256: 1bc64d6c20b054ad278dcba4916251f44902794b1f40d00ef67e8f6b3d534738

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript/JScript T1190 Exploit Public-Facing Application

The PDF file contains embedded JavaScript, which is obfuscated and uses the unescape() function. A critical heuristic identified the CVE-2009-4324 vulnerability related to media.newPlayer, indicating an exploit attempt. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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. (matched in decompressed 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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `ed214d008ca7f8fad0affc792159f2b30ce479dc90c5348e0751937c74ebe0c2`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	291 bytes
`javascript_obj111712_001.js` `8dde11006e0bc3e628515fec86b5987f6b42ddd8924bdc9bc64bf202fe7460cf`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x2B2	960 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj111713_002.js` `d2f98bec78aa096efa5aca99b701d5e6b9a8e2cf728fb7e79bf248862bacf14b`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x50B	70 bytes

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