PDF malware analysis — malicious · c9ce281139a27073

MALICIOUS

PDF

39.9 KB

MD5: 1deda3e941af214271a8e96e965678db SHA-1: 975fc50677333f107f7eef5a89e5ec2637bc210a SHA-256: c9ce281139a27073169c6f63cfa55d5ecffcf4ba1d0a28045f04840ea11c3614

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ClamAV detection 'Win.Trojan.Agent-36169' strongly suggests malicious intent. The embedded JavaScript, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', likely downloads and executes a second-stage payload, a common technique for initial access and further infection.

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` `eccf08e42382865fc4f0c15ff4762b6c22e03d659e3630366ed47ed56491c3c5`	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).

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