PDF malware analysis — malicious · 47e1e9e60605e050

MALICIOUS

PDF

15.5 KB

MD5: 12ade5f4a2e598585bae3582263ae090 SHA-1: f4f1addef006b354946c3b9195de2b96f1d6847f SHA-256: 47e1e9e60605e0501f6b3c8b8a407437d85281c612e1b9913b7899d4175e8103

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript, particularly the 'eval()' call and 'String.fromCharCode' usage, suggests it's designed to download and execute a second-stage payload. The presence of obfuscated JavaScript streams and extracted JS files points to a downloader or dropper functionality.

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` `459d996147cdc5b422d111d307b2f1ea1c8de3e9c5674f5f0d2981521f5d4a91`	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` `685afa5237dac834dc5d5220aadc5797f9d0bc7d809a28ee6c221eed55096d86`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A84	11595 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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