PDF malware analysis — malicious · 47fd7a41ffdb92fc

MALICIOUS

PDF

118.5 KB

MD5: 19b540091ad5f86c6762641b963f15c6 SHA-1: 7a172038f216ec355c9036a20d3f1e57d06a2086 SHA-256: 47fd7a41ffdb92fccde5f5bb1fe2d02cca347ef3914d2164770fa7ca5bbe6bf4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a PDF file that contains obfuscated JavaScript. Heuristics indicate the use of eval() and fromCharCode, common techniques for JavaScript stagers. The presence of 'Large comment-padded JavaScript eval stager' and 'ClamAV: Pdf.Exploit.Agent-36086' strongly suggests this PDF is designed to exploit a vulnerability and download a secondary payload. The exact nature of the payload is not discernible from the provided evidence, but the overall pattern points to a malicious downloader.

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` `9ce19bee12b1297628b90e0e04e7015542a6b17061aa6d6c1c6d7ac9f7420a10`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626480 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` `58bbd7ee6372055c63c86602020736e87279123e511389e214233f4f1c686109`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 555 long base64-like blob(s).

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