PDF malware analysis — malicious · e2733f3502bcbba4

MALICIOUS

PDF

15.9 KB

MD5: 1d59d6ff0622ad5b50feb7effd2981b1 SHA-1: afa87fbee47e50c873ee774e91aba832f446486e SHA-256: e2733f3502bcbba44f57dbfe7384dc8757a60bf3f86bb6172c21847c828312c5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained embedded JavaScript. The JavaScript utilizes eval() and String.fromCharCode() for obfuscation, indicating an attempt to hide malicious code. The primary function of the script appears to be downloading and executing a secondary payload, which is a common technique for malware delivery. Due to the obfuscation, the exact download URL or execution method could not be definitively determined.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `8457823a28fa982bf66da8369ba84ec4ae7272ae9adaadf94a7c2de6d159bffa`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `9646e7526799acf353a3bbb1421eec26808c2223101c3446e5a4185908532c92`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AB3	12239 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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