PDF malware analysis — malicious · 937d5d179009edfe

MALICIOUS

PDF

118.6 KB

MD5: a5e9cffa7abed0afc3d4a26b6d9bc753 SHA-1: da9e69580aa160eeaf62054c8879a880e12ed2ed SHA-256: 937d5d179009edfe32c6444fa23ed10becc9261692ab213b58d62865f99d89ae

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, with heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscated code execution. A critical ClamAV detection of 'Pdf.Exploit.Agent-36086' strongly indicates malicious intent. The presence of large JavaScript streams and the 'Large comment-padded JavaScript eval stager' heuristic point towards a sophisticated stager designed to download and execute further malicious content.

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` `5571b22bbed9e3cfb523b41f3879e217fd1008a5f233390dea0d6d0aabd152ed`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626793 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` `2f0d99aaf237d6340dabca1fac896b900438121e3a9cea067661bf21a44389e9`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 539 long base64-like blob(s).

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