PDF malware analysis — malicious · e53c3dc8a0588b9e

MALICIOUS

PDF

118.7 KB

MD5: 0623c77a845cf5ade5c36156758fc867 SHA-1: f7c82e3af9c3e02a4c3e1ec3c644fea76beedaa6 SHA-256: e53c3dc8a0588b9edec6129034c33ae77be2d83cf0bfc139fab9c67a2d0a7c4f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript

The PDF contains embedded and obfuscated JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics, including a high-severity PDF_EVAL and a critical ClamAV detection for Pdf.Exploit.Agent-36086. The presence of large, padded JavaScript eval stagers suggests a complex steganographic or obfuscation technique designed to hide malicious code execution. The primary intent appears to be exploiting vulnerabilities within the PDF reader 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `95448f7c8e838add3211a4f3af518119e2ee78ed798aff7284fe6ece707314ed`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626438 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` `9f88c8b23ba00864b61d0196dfa44e8a84ed5143c96ced7d56dbd99b9f0a9205`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 526 long base64-like blob(s).

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