PDF malware analysis — malicious · 3b3e5bb4d766f7d3

MALICIOUS

PDF

118.6 KB

MD5: 32e7c774aaf968fa81c891522b38571b SHA-1: e13c2bd45aefadcea768dd232a4a601d6707699b SHA-256: 3b3e5bb4d766f7d3cae5eed79ae773a365283263580a901a947fe2ae1651b33a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is heavily obfuscated and uses eval() and String.fromCharCode(), indicating it's designed to hide malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is an exploit-based PDF. The primary function appears to be downloading and executing a second-stage payload, though the exact URL or mechanism is obscured.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `31f0f36f4771b43bcdaa8889b057d59fb1dad20ba69de06f819372f5bd1f588d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626950 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).
`stream_001_off0001d6f8.bin` `fadbb3a11fc412d05ed8d0be0e8e6b47b3f572f3af33566370bb1d8b3bd46fbe`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6F8	300 bytes
`legacy_pdfkit_stage_000.js` `e91383a1c71a95c8c3c3b47dd5235982b2d18cf4b9d87df946e3ebf609d41ab7`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 584 long base64-like blob(s).

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