PDF malware analysis — malicious · 57e5341776bd2c3c

MALICIOUS

PDF

118.7 KB

MD5: 4f34eb798428b38cc86bb22f566a7c3b SHA-1: 830826f7e4f9f7b813076ff3a3a3c211dc8e0af6 SHA-256: 57e5341776bd2c3c264eee21acaae54fc88bc6d25a5bdf8a0cd39c4e3f2d506b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36086. Static analysis revealed embedded JavaScript with eval() calls and String.fromCharCode usage, indicating an attempt to obfuscate and execute malicious code. The presence of a large comment-padded JavaScript eval stager further supports this. The document body was unreadable, but the heuristics strongly suggest the PDF is a delivery mechanism for JavaScript-based exploits.

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` `da0f583ade5c6e2b2cff0bea0f78002527490df7cde97110fb89de1919114030`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627083 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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