PDF malware analysis — malicious · 991715c2f3f538f2

MALICIOUS

PDF

27.7 KB

MD5: 4b90559e07e4c8f2a74d58cfcbbb2461 SHA-1: 3888358fe332e7b8c7ac28d069fdf31c9334ee37 SHA-256: 991715c2f3f538f22d19f570c31223f117877fe7cc37bb7cafe4ecdd2cb0483b

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was detected as malicious by ClamAV with the signature Win.Trojan.Agent-36100. It contains embedded JavaScript, which is often used to download and execute further stages of malware. The obfuscated nature of the JavaScript suggests an intent to evade detection. The extracted JavaScript files are likely responsible for the malicious behavior.

Heuristics 4

ClamAV: Win.Trojan.Agent-36100 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36100
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `3d3c998dbdcf18d74428a95e2b4c8d6014c09391b20db46c6ce41ee28dd71f33`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	27621 bytes
Detection ClamAV: Win.Trojan.Agent-36100 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `e9bc0ed9508be60a2d5f205a94e5745802e7797dc9ce604b534314a4210a256a`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x1E7	15189 bytes

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