PDF malware analysis — malicious · 596147246b1ade49

MALICIOUS

PDF

118.5 KB

MD5: c2ef9e7ee0e4c00b98eb6bf9ecb7f220 SHA-1: 6373083564e8314e143eb1fb33fb18c717720179 SHA-256: 596147246b1ade49160ebb2010c1ef30e07e9a06e17838ec55e4a5a3dbeb06c0

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains heavily obfuscated JavaScript, including a large comment-padded eval stager. Heuristics indicate the use of eval() and String.fromCharCode, common techniques for executing arbitrary code. ClamAV detection confirms this as a malicious PDF exploit. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js' artifacts.

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` `810862c248b48da3a09b107357537a2abb879cab4f42dd51bc698b490df6f4db`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627585 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` `161cb7c9b9adf834ae51d1872c8f728867d96a84174e4b521a8d234b7e05c14a`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 614 long base64-like blob(s).

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