PDF malware analysis — malicious · 9182c23f13fd8d1e

MALICIOUS

PDF

4.0 KB

MD5: a6761501df7e79c7c94e2ec03b0a54cd SHA-1: 2bad86f7d56fccca3c364c35c170b60b90d3227c SHA-256: 9182c23f13fd8d1ea74b842ecc80ad9f2350b7f4f8359b3c3e1181debb341732

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as Pdf.Dropper.Agent-7282950-0. The presence of eval() and String.fromCharCode in the decoded JavaScript stream points to obfuscation techniques commonly used to hide malicious code. This code is likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7282950-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7282950-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0013_001.js` `25a4332951642c756deb6b4171f85370ad30166d2516f4c26d7cbe843d8e3bd6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6317 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `74c5fd4e6d2d8928403d6a9223b468215ec51341bd40f8ce595e45d25de4ee63`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3585 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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