PDF malware analysis — malicious · af0e991eebe0364a

MALICIOUS

PDF

15.7 KB

MD5: c220bd70e5771a73b90785b365a68119 SHA-1: 950ec85623b1d8d1682734eae7ed82aa0d4926a4 SHA-256: af0e991eebe0364aa75e3501b8ceeedcdfeb6b79601b83abd23ac6eb05880113

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link or Anchor T1071.001 Web Protocols

The PDF file contains embedded JavaScript, including a high-severity 'Large comment-padded JavaScript eval stager' heuristic firing. This indicates the script is designed to deobfuscate and execute further code. The presence of 'eval()' and 'String.fromCharCode' further supports this. While no specific URLs or network indicators were extracted, the ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit delivery mechanism. The primary attack pattern is likely the exploitation of a PDF vulnerability to achieve arbitrary code execution.

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` `7b492a791f809ccdcd9ce4be89c68bcf5b9ba6d009f7319574af9de2e87088d5`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424992 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` `e19e280fbe36cab606bcefd91ff49699c81183dff97094b831bc7191bdc22416`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 693 long base64-like blob(s).

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