PDF malware analysis — malicious · 3197658faa0e21e4

MALICIOUS

PDF

184.0 KB

MD5: df15b51defd427cea55782e454f94d4f SHA-1: 7505cab2405293d5486869cf9be6ba0be111d26e SHA-256: 3197658faa0e21e4c4c75070d238344c1278831571671fd4c31fc9b879d7978d

76 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript actions and streams. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript file, javascript_obj0008_000.js, is the primary artifact, and its presence suggests the PDF is a delivery mechanism for a more complex payload.

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` `2e97c9ce6ca0e48be921e4b60678041610cc5cabb75861859eed74bab589face`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	62535 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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