PDF malware analysis — malicious · fe755aa27b05c0cb

MALICIOUS

PDF

79.2 KB

MD5: b6eaf2996b3eb45c8c3c0983774972c5 SHA-1: c880df2e8636b51a13e94b6e40fbf031491876b8 SHA-256: fe755aa27b05c0cb09c42cf43498e0676a1fccdab1ffed14c61899ecf62e3c08

136 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript that is obfuscated and uses the unescape() function, indicating malicious intent. The critical CVE-2009_4324 heuristic firing confirms the exploitation of a known Adobe Reader vulnerability. The extracted JavaScript file, 'javascript_obj0008_000.js', likely contains the payload or further obfuscated code, and the deobfuscated 'legacy_pdfkit_stage_000.js' suggests a PDF exploit kit was used. The overall goal appears to be the 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. (identified after JavaScript deobfuscation)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `af3fa2ebc63d7090e7a1fe615c7f2c006732a0073f08d10eaa6cbf56103f8555`	pdf-javascript-stream	PDF /JS object 8 at offset 0x210	2195 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`legacy_pdfkit_stage_000.js` `42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x210	126 bytes

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