PDF malware analysis — malicious · 3bd326261b9a251c

MALICIOUS

PDF

18.2 KB

MD5: a7d518021693487fe81a5e179b9ad6c9 SHA-1: d98002080dcffb3f3cb9b4943beb7188c85990aa SHA-256: 3bd326261b9a251c3df7f46e0a4aed6057a50132f4989b50242ec65f4128e798

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating an attempt to obfuscate malicious code. The critical heuristic firing for CVE-2009-4324 (media.newPlayer) confirms the exploitation of a known vulnerability to trigger this JavaScript. The script's primary function appears to be downloading and executing a secondary payload, as suggested by the obfuscated code and the heuristic indicating a multi-stage exploit. No specific malware family could be confidently identified.

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` `60506f11ffff9284e3baa708d342a2be048b00132a692213e2a60b4aa66d611c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3118 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_obj111712_001.js` `9c06f20dd07dafa4726629abb721da9a4dfc0278acb3c1f6a601eab52b9bf90b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDF2	12723 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_obj111713_002.js` `ae73931fa0dbfe822ed30de0ebddbb96dacfc227c36bcb4e046625a54ecf00ed`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3FDB	2155 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).
`legacy_pdfkit_stage_000.js` `77e31ee392e03e0109a99a651a1f965cc21f4a579111db265d7fa458cb9d2899`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDF2	1080 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` `cdcbb2c0a3c2d01f21bca0076e63032df376b21d6f88bb534399b724bc12b655`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3FDB	168 bytes
`legacy_pdfkit_stage_002.js` `aad5f9445562aee349c9ee1a2cdd76ae3c3ffe5f1ec045822869a2d9c5ce4953`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDF2	1249 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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