PDF malware analysis — malicious · 8b1a34d6776a93f3

MALICIOUS

PDF

17.1 KB

MD5: b1760633cbf410325dcfead7cf7cbd94 SHA-1: 94f8ba8460599daaba5b9eff0d3880c19be9e26a SHA-256: 8b1a34d6776a93f39b747355b8fd4712eebd5b4c555e531607fa60375f0f106d

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, as indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE_2009_4324 heuristic specifically points to the use of `media.newPlayer` to trigger an exploit. The embedded JavaScript, particularly the deobfuscated `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_002.js`, likely attempts to download and execute a second-stage payload. The reconstructed JavaScript functions `eval()`, `unescape()`, and `String.fromCharCode()` are used in the obfuscation and execution process.

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` `c770c6087bd2566316b60dcd9c19d745fdbc89ebdb747122b08df20f00da5c89`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2984 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` `d5f6b5659e8e3daf48a3fddda8c65f06b4d0fc84810355c9293b8d67a8c176a4`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD6C	11668 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` `3edbc572f2860ad6fbd63007e0663887ab6e477cabe7e7c116ff632c2b849e82`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3B36	2269 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 0xD6C	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` `7327e312014d3efaf3a610a4c834310111e67cbf5c4736226bcf894c31f372d4`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3B36	169 bytes
`legacy_pdfkit_stage_002.js` `de30d8ae074237656eb0616eaa24a2be5d2102824ba01a4e1d6a1dc6d928f970`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD6C	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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