PDF malware analysis — malicious · b4078b45e1dd521d

MALICIOUS

PDF

118.6 KB

MD5: b5f073c4e9828fe8732807b15c1c1f97 SHA-1: 6eaf442d170874bc1c71844b93be94b3f1ba4dfa SHA-256: b4078b45e1dd521d04c5a14e218e889dc0bcb2d91c414b50232ca232deefa0c3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file was detected as malicious by ClamAV with the signature Pdf.Exploit.Agent-36086. Static analysis revealed multiple JavaScript-related heuristics, including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_JS_LARGE_COMMENT_PADDED_EVAL. These indicate that the PDF contains and executes JavaScript, which is commonly used to exploit vulnerabilities in PDF readers. The presence of a large, obfuscated JavaScript stream suggests a stager designed to download and execute a secondary 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `0328b35fc7fa7d2ed8cf2258aa46d30c5fe99d20a7a6ae5279eed2d0da963b73`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626784 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).

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