PDF malware analysis — malicious · 54711be5d691e9d4

MALICIOUS

PDF

12.1 KB

MD5: 0a17ebf4462cf6e5e57a14323d974942 SHA-1: fee02a072fee9e72732a687003a956cb5fd07831 SHA-256: 54711be5d691e9d424ed88de04b04442e147405ddbd2ea970a80c5fb56e05a46

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS firings, and the use of String.fromCharCode and ASCIIHexDecode filters suggests an attempt to hide malicious code. The embedded JavaScript file, 'javascript_obj0007_000.js', is highly likely to be responsible for downloading and executing a second-stage payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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` `8fa1398abf330fc2a376fa09b117b9ce568cf0a60c2c99273c0bd83b6472c1be`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19E	12824 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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