PDF malware analysis — malicious · e61ffbb7d3a6c534

MALICIOUS

PDF

15.7 KB

MD5: 9d3f2ef6f4467ccef22a4f109930ee9e SHA-1: e2daa9cd27cf23cc6400529ac7964f09278b6d26 SHA-256: e61ffbb7d3a6c534a933a92d7aad82c7b91b9edbdb9bfbe1298e49bc46f6088a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a heavily obfuscated 'eval' stager. This script is designed to decode and execute further malicious code, a common technique for downloading and running second-stage payloads. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The presence of JavaScript actions and eval calls within the PDF structure strongly indicates an exploit attempt.

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` `1b227237961d0429cf075bf82a6a08af5f8b52f458e4c7118ffeea931b7727d0`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	426140 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` `a4a6bb0dad90cf3fbb6a2188d50bd3918e9937c4dc19a580dba353b4cc24d4aa`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 556 long base64-like blob(s).

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