PDF malware analysis — malicious · f2bc1778b5aa2995

MALICIOUS

PDF

12.4 KB

MD5: d2e33135d89a2a02829881777520126a SHA-1: 5b1e7497576445138848d62e1419048495897729 SHA-256: f2bc1778b5aa29959ebf923e12587862e1c60dabfae3f6d8aef386be8e66ea7d

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier and ClamAV as malicious and obfuscated. Heuristics indicate the presence of embedded JavaScript, which is likely responsible for downloading and executing a second-stage payload. The obfuscated nature of the script and the lack of specific indicators prevent a more precise family attribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b9f417bdc7be80d2e2fe6b76cdc2e954fa82ffe96cb76cc7057c0c70dd0e9fe7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19E	13039 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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