PDF malware analysis — malicious · f77c169717fa8d7d

MALICIOUS

PDF

118.6 KB

MD5: da002c1ea658350f5ea3526a2f6c2a9a SHA-1: 80eb459f6b22d2238f25731e5ff729b1062ea3fe SHA-256: f77c169717fa8d7d6f6cdee267a92e17c6d7d627b461d5a63aa708842feb3e53

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1105 Ingress Tool Transfer

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-36086 and a machine learning classifier indicated a high probability of maliciousness. High-severity heuristics indicate the presence of obfuscated JavaScript, including eval() calls and large comment-padded stagers. These JavaScript streams are likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

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` `a34398badeaf7b1bc9ed415229301cb83527d47a3cebdfad792b1b0e74ed50d5`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626904 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` `6ed5091eaf2c8abc0a20d63b742134e9a6ff5d26ba3b6d2924873e78ab5cd587`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 681 long base64-like blob(s).

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