PDF malware analysis — malicious · 997d6884f9811a67

MALICIOUS

PDF

19.6 KB

MD5: e4088876b148d944fb9a4c0c8922fd33 SHA-1: a0e4df6b2d9160cd89e6f9ce77ea49c385236540 SHA-256: 997d6884f9811a67da88afceec5af50fe794623a705e793dff2dcf47cdf9fcee

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscation and dynamic code execution. The critical CVE-2009-4324 heuristic firing confirms the exploitation of a known vulnerability in Adobe Reader, specifically related to media.newPlayer. The deobfuscated JavaScript suggests the script is designed to download and execute a second-stage payload, which is a common technique for malware delivery. The ML classifier strongly flags 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. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `a9dd1f24b4f64b6db9a0c88e515c1a8f156032566a011a59a5b8a84755ca436a`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3176 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `548a938c92649026a2573e639e9d05140ec3ff1d95be492d9fd2e00b731bc5ae`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE2C	13570 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `dbd467b22134e3b1d965410469499eb0817df6d5587b5cde339969ebe4a4d56a`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4364	2684 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `3af672dfcc1afa5bf58c9f0f873abaa25352c06c31913820aee3811b939271af`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE2C	1074 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` `48650693b3d12c9191e411d99a58016f03794f98b99f34058c05b3d69aa8f708`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4364	175 bytes
`legacy_pdfkit_stage_002.js` `8fec5e0be9ae87a54115d2a8048d632570805b5b13ae367718b3d1135943c4ad`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE2C	1250 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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