PDF malware analysis — malicious · 4972dc05e70a407d

MALICIOUS

PDF

7.5 KB

MD5: 98665dc82e572e771091f83af4c868b4 SHA-1: 5802825cd34ddb7cd251e35b0572f45e654d8f44 SHA-256: 4972dc05e70a407d1715a8e2527ef1b22fbbdaacc3589546eb852aeb71f0bbb6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF as malicious with a high score. The embedded JavaScript likely attempts to download and execute a second-stage payload, as suggested by the use of eval() and String.fromCharCode, common obfuscation techniques for malicious scripts. The presence of obfuscated JavaScript streams further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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_obj0004_000.js` `e106b786ec177b5c8871bceae729a98b08979224a847a13eb9dc600a2fdf82c6`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001bf1.js` `766deeb147dfd8290773b65f774ec8666952ffd119e7f5015710898de0d419bc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1BF1	300 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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