PDF malware analysis — malicious · 95278b25464a0a73

MALICIOUS

PDF

6.1 KB

MD5: 5a1936408bbc314fd6217b0aa5b3c090 SHA-1: 38318f9e403205a1090289f26a87cc1b61a3885d SHA-256: 95278b25464a0a73c32b07273ae28648f7012659ed2afac349934dcb201635a9

238 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF file exploits CVE-2009-4324 using obfuscated JavaScript. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', contain eval() calls and are designed to download and execute a second-stage payload. The ClamAV detections 'Heuristics.PDF.ObfuscatedNameObject' and 'Js.Exploit.Shellcode-18' further confirm the malicious nature of the file and its extracted components.

Heuristics 7

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)
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `42323c657673e4d1bce0a6ae38beebb0275800b752313dc6f98b7a03afa02190`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2874 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` `f7d41259a823eb283733f9b18bf052cd928186bb4967b79ac6c9c59a8a99d035`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x750	11710 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` `46f53396f43ae17a2bfdf243e6685f185cfed3884903c7d39a044bc23013702e`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x1355	2573 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).
`legacy_pdfkit_stage_000.js` `2a561a0e36ab8edad6d33ec1a29e5e64d1e5dc41fd1acb59dada1a3dc08d4c78`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x750	1008 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` `5091795dc7dfd1e269d30a5ab394f1536cab6157b0cb74b7e26a9fdc9129a46f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1355	165 bytes
`legacy_pdfkit_stage_002.js` `eeb1f0af01ea14f319cceb55e0caca433cf231736c29d53b0814fcb6d3f65a30`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x750	2349 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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