PDF malware analysis — malicious · 5651ecd877744c13

MALICIOUS

PDF

21.2 KB

MD5: 143101a990120b680d66f0f0cb4ec671 SHA-1: 83d6f013d1bcdb1864d03f306a427f7f184874fb SHA-256: 5651ecd877744c1375817b8874c9f8b761b2d31cbd87cdb19997379066a5ee8c

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by PDF_JAVASCRIPT and PDF_JS heuristics. The ClamAV detection indicates it is a known malicious trojan (Win.Trojan.Agent-36169). The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, likely attempts to download and execute a second-stage payload, a common technique for initial access and further infection. The DOC BODY content appears to be obfuscated script fragments rather than user-readable text.

Heuristics 5

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `fbdfda8591b9916ed8ec0026d0d9e2341da92e069f958c5a94cf17edec93090f`	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` `c3df0b6d669953258363ab802ac0d32c63d5685d76eb2e0ad1f70f86b924f691`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x9FE	1256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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