PDF malware analysis — malicious · 1f2ae8c641a181ff

MALICIOUS

PDF

118.5 KB

MD5: e457f123307ab750daadef6c57822c86 SHA-1: b2efb81e2a53f77cd241df23a549197ad409b1e8 SHA-256: 1f2ae8c641a181fffbff8343a03540bccc52db8c7727ca71dad438eb9da841d9

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The file is a PDF containing heavily obfuscated JavaScript. Heuristics indicate the use of eval() and String.fromCharCode, common techniques for executing malicious code. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely acts as a stager to download and execute a further payload, as indicated by the 'Large comment-padded JavaScript eval stager' heuristic.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `96172f8060fd9e530e84a33f0577a3fcc4a4157162cd1a3e7233f5459ab3af62`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627318 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `52b27f5cfb77e24af1620b3635945273885b5412922d3dd5efe861559a5f05de`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 580 long base64-like blob(s).

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