PDF malware analysis — malicious · c9117f0d66c32afa

MALICIOUS

PDF

39.9 KB

MD5: 0bab90ce79dd3bc2ff935b099da53848 SHA-1: b10baf74c0b348322bb8f36d7e01539ef10867f1 SHA-256: c9117f0d66c32afa8b12b23d76f4e686d3a17c30f0357803185804aa40ff171e

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The ClamAV detection 'Win.Trojan.Agent-36169' strongly suggests malicious intent. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, likely downloads and executes a second-stage payload, as indicated by the heuristic 'Script obfuscation indicators'. The DOC BODY content appears to be obfuscated JavaScript code itself, further supporting this analysis.

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` `b79ab5c6d40248524f8aa91351b0d7b36c8f0823252a230844110be6afc3fd9b`	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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