PDF malware analysis — malicious · ef38c860ecee67ab

MALICIOUS

PDF

40.0 KB

MD5: 3070918c9d31a4eadd4c5d620afa09e2 SHA-1: c8687088c9cc2ef7194aa00e89fe7d4073fa41d6 SHA-256: ef38c860ecee67ab8775e2c7370f245781282a45ed26a66435cde9e210df277d

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

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', is likely responsible for downloading and executing a secondary payload, a common technique for initial access and further infection. 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` `c5c3faa40320e4738a2d1c31437ed9d279e64245d3e1f20fefd6e8c2be02b7ab`	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` `ecef8c2cfb1478dfd65c9b910d69c5ef07805909a65cc3ddd5c942deecc6f5d4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x9FE	2540 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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