PDF malware analysis — malicious · 20258fab6bb03a3f

MALICIOUS

PDF

16.6 KB

MD5: e2a447fb966d4baf62f0c3dbad5a226c SHA-1: 4caa0a57ec64168635febb42ac59746c59b0f542 SHA-256: 20258fab6bb03a3f0f204fa5c5ca2f733d0ccf3665065497f7cb42c58bca583c

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval(), unescape(), and String() functions, indicating obfuscation and dynamic code execution. The critical CVE-2009_4324 heuristic firing confirms the exploitation of a known Adobe Reader vulnerability. The embedded JavaScript is designed to download and execute a second-stage payload, as evidenced by the deobfuscated JavaScript stages.

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` `7405740465b737d72494300fd1672d7bc2c6c11195845da28629b2c34eec17c2`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3055 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_obj111712_001.js` `37ec27f519dadad6ee5c96fabf1d7793742bd68b8fc3f43f35f84d4ff177f895`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDB3	10803 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111713_002.js` `4a3468c4715341a928ac87d83fa9e4b441032172123a120b0fa202e419c8c960`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x381C	2555 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` `e10730d6d35010db60bac40ecf65af2e42d2911261510675be0a593616c41165`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDB3	1082 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` `cd7088aa0ba5ce42db7faac79c4063dccc339c8953139714658e9cb6b07c91fc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x381C	165 bytes
`legacy_pdfkit_stage_002.js` `8b082473408cdff794107dfc1f3f3d0ea38be662f8a1082b00b4511e7e6b99f1`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDB3	1248 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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