PDF malware analysis — malicious · a3ab04903534fcc4

MALICIOUS

PDF

118.5 KB

MD5: c5f613eb86e51d6ceca7ac2c671e3fdb SHA-1: ee3062d998c5736010f1df44ac46468d841bcc57 SHA-256: a3ab04903534fcc4e413a9eea7065cf8f8801bcdc0fe265be88ea37cc9b25cc2

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple JavaScript streams, including one with a large comment-padded eval stager. The ClamAV heuristic indicates it's a known exploit agent. The JavaScript is heavily obfuscated, but the presence of eval() and String.fromCharCode suggests dynamic code execution, likely to download and run a secondary payload. The extracted artifact names also hint at a multi-stage delivery process.

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` `4340f2cfef710cecc1db0079b45189c63c5402706065ae9b10697906b088bd33`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626567 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` `029041f28640e4aaab61ed87b3dcf4e36fc8c07be7404833c6441644d4f39691`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 597 long base64-like blob(s).

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