PDF malware analysis — malicious · da876f1762666325

MALICIOUS

PDF

118.7 KB

MD5: e5de9cc2eb1a574de251dd5ed18666f9 SHA-1: 93770e33bf7904dba8b4c67bd1cd3326fe520c68 SHA-256: da876f17626663257b5c2c191890a483cb58eb83c0e324a416973ac74a59ed23

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, including a large comment-padded eval stager, which is indicative of a downloader or exploit. The JavaScript likely attempts to download and execute a second-stage payload. The presence of PDF-specific heuristics like 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL' further supports this assessment.

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` `3d8d311d98ab0655a9eda22fe4564af7dce352596786f463f578e0ffd986ffa8`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626860 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` `544006f34dc23f4cc418cf6a819f69ec36cea20d25c93def9a89f0e49e4d1580`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 637 long base64-like blob(s).

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