PDF malware analysis — malicious · 317c3c51f93631ef

MALICIOUS

PDF

21.1 KB

MD5: 5560dd1514e0b6cabccfbfe02ff706e2 SHA-1: 53e8d35d992a4235c74eeca14dd9d434b86eb74b SHA-256: 317c3c51f93631ef4416ef2bae847586afa4617283447f8177e8c95b7e63f645

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The ClamAV detection 'Win.Trojan.Agent-36170' strongly indicates malicious intent. The deobfuscated JavaScript, named 'legacy_pdfkit_stage_000.js', likely serves as a downloader for a second-stage payload, although its exact functionality is obscured. The DOC BODY content appears to be obfuscated JavaScript code itself, further supporting the malicious nature of the document.

Heuristics 5

ClamAV: Win.Trojan.Agent-36170 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36170
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` `8aff99cd3b09aa1a2bac202a1e0a59d09bcc0ffe7a251dec03d4a8b4f51ccd7c`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1783 bytes
Detection ClamAV: Win.Trojan.Agent-36170 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `74ec3cb337edf350b5765f62c42413691496f354b384663ed33c29ced9b105e0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x912	1268 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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