PDF malware analysis — malicious · 4fa05bd1c53ee658

MALICIOUS

PDF

183.3 KB

MD5: 9e1b2b385c8f43838f52bf16ead66935 SHA-1: c04370a85f540f57759b5f67d1f9a1d383fd982c SHA-256: 4fa05bd1c53ee658884f14c8bc385cffea5ff613aea40e80ffc2cd8bb80f560f

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream, identified as javascript_obj0008_000.js, is likely responsible for executing a secondary payload. The presence of PDF-specific heuristics like ASCIIHexDecode filter with exploit indicators further supports the malicious nature of the document.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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_obj0008_000.js` `fefac05bfde6717c79df9ab012eac4b635a1381bfd2e57ea91c3981d7d9cca4b`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	62311 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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