PDF malware analysis — malicious · 36c8a905f2659559

MALICIOUS

PDF

1.4 KB

MD5: fd3b2d2fa3736ed7dc43c842b0a636f2 SHA-1: ecb3bcf875ae31c5cb6d974641e64e725ef32cab SHA-256: 36c8a905f2659559596a29e34959d3293b2e5d138055b210145bbe311e5a3466

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1204.002 Malicious File: Malicious JavaScript

The PDF file contains embedded JavaScript, which is obfuscated and utilizes the unescape function. A critical heuristic firing indicates the exploitation of CVE-2009-4324 via the media.newPlayer object, a known vulnerability in older Adobe Reader versions. This suggests the primary goal is to execute malicious JavaScript, likely to download and run a second-stage payload.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111111_000.js` `26d357fdf43c41e02290f1971f357f045717f528f394b2f87f5e2647763f2d5c`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	1247 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111112_001.js` `6fca9fb39f6e7c81aa4de7c27752d4ba0031fa77884184039361123b4b9f756b`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x480	253 bytes

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