PDF malware analysis — malicious · c7afbd3f3a273dc3

MALICIOUS

PDF

130.5 KB

MD5: 41cfb32d5aa70861e6bcdd6d4aaabc92 SHA-1: 5df732d24e4f74037b415d706803627567b6fa9d SHA-256: c7afbd3f3a273dc37e73f5a367502417ea6cc14742f16ef98107a751b26cedf5

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2009_4324 heuristic suggests exploitation of a known vulnerability related to media player functionality. The JavaScript uses String.fromCharCode for obfuscation, a common technique to hide malicious code. The primary intent appears to be the execution of this script, which likely leads to the download and execution of 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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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_obj0007_000.js` `7165d2c38e5a1ab05a7380812b7e5ff33a89a0529db241d4ba714f7ee3a59232`	pdf-javascript-stream	PDF /JS object 7 at offset 0x37B	953 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `59bbd607f3c2b5ec03961a94020c40651447df0ffd2415991ac82f905c02f53d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x37B	196 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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