PDF malware analysis — malicious · 4e7f9ed657957c4b

MALICIOUS

PDF

39.9 KB

MD5: 7f2bfeb10a79ab410f43c9840e53b6a7 SHA-1: 73bc51394a7d351775913c0c135094c31239b86c SHA-256: 4e7f9ed657957c4bcc056c86bc8fa721f3c32d12d974cc4010f479544428b425

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and exploits the CVE-2009-4324 vulnerability, indicated by the 'media.newPlayer' heuristic. The embedded JavaScript, particularly in 'legacy_pdfkit_stage_000.js', is designed to download and execute a secondary payload. ClamAV detections further confirm the malicious nature of the file and its extracted artifacts.

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` `4498a748c60bd35fb1766cd26651b5a31d1c0be304c7c2689eb4ef8ebe5d9dd8`	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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