PDF malware analysis — malicious · 400768625a7ba155

MALICIOUS

PDF

118.5 KB

MD5: 2685650096a1c40cce1cc4c95a70a2e9 SHA-1: 3ceb02e6560817f1e80715157d8b565f92ef1871 SHA-256: 400768625a7ba155349ff9cc8dc74d2d0d87a4828ac45c1c28b3b9d0bfaf6419

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. The 'Large comment-padded JavaScript eval stager' heuristic and ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicate malicious intent. The primary function appears to be the execution of a stager script, likely to download and execute a further stage payload.

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` `8bdf37396aa4fe6341c487b7fd45e9d9ab9151b2ba586a3e078f2c11372ac80d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626487 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` `5bbf65e248aef83f226894af5b2e04606bf9533b09f82a464b914b1ddf551da1`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 606 long base64-like blob(s).

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