PDF malware analysis — malicious · 31ad43597e845cb3

MALICIOUS

PDF

4.0 KB

MD5: 12522b7d499cbaabc5aef03a3ac49c11 SHA-1: 2735076f0984fe2bd9e7df7966d9c06de1cff325 SHA-256: 31ad43597e845cb3f2d65f0b15413894309871054c7e47f5e8764f4020874612

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscated code execution. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Dropper.Agent-7246325-0. The primary function of the embedded script appears to be downloading and executing a second-stage payload, as is typical for dropper malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7246325-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7246325-0
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` `9d3a6d26764d49c3d90b25faa6e49a4358682e221aafdf861d6b8ccd77531631`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6321 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` `a023db524e2efb7feae538a8084d50812946c9299dd9779abe993c27509c3832`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3587 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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