PDF malware analysis — malicious · 1ff1101a01c6a552

MALICIOUS

PDF

15.7 KB

MD5: a67454bfc6592929e461a55eb5197a6e SHA-1: 13f24fc472f1d2b086c9c291f2329ff99853b157 SHA-256: 1ff1101a01c6a552e9f1463908822113cac44fb9210eb691c388293c4bbd4174

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic suggests a stager pattern. ClamAV detection 'Pdf.Exploit.Agent-36086' confirms its malicious nature. The JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact mechanism is obfuscated.

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` `b8dc3030ae7671969026fd07e1b2c945f018cd2f2136764d0c90f291f66dcb65`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424787 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` `effae3bc41ebd08593a6b1610835fbb5883b8f293cac8a7f71a2c52657b034bc`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 721 long base64-like blob(s).

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