PDF malware analysis — malicious · c1a17b4086cd40da

MALICIOUS

PDF

39.9 KB

MD5: b8bc81262b268e69f68dd0aef96de298 SHA-1: 02d59e31021534f55b86f690574bda2e33fe7d32 SHA-256: c1a17b4086cd40da9bf2f2b8e0c7010aacf9d55ff27a61b5c74b58f3dd6164cd

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript and triggers a known vulnerability, CVE-2009-4324, via the media.newPlayer API. The embedded JavaScript, particularly in legacy_pdfkit_stage_000.js, appears to be obfuscated but is designed to execute malicious code. ClamAV also detected the file as Win.Trojan.Agent-36169, indicating a known malicious component. The primary attack vector is the exploitation of the PDF vulnerability to run the embedded script, which likely leads to the download and execution of further malware.

Heuristics 6

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: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36169
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `a92abf3fcd928f8d61d23e069661950761a7b80b94a54d1076620a8eeab79537`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2019 bytes
Detection ClamAV: Win.Trojan.Agent-36169 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `4e225c059cd17abe33884c93d6a7bd250aa680bbb866e1b3f1f0fd18974150d6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x9FE	2534 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` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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