PDF malware analysis — malicious · 24fb7ee6a44233d9

MALICIOUS

PDF

118.7 KB

MD5: afe9d23be0345bb05ff67d3f1dade068 SHA-1: 70684cd3a8505e95ec1ce97ef6ce1c37f2789ae1 SHA-256: 24fb7ee6a44233d95f3176b5b01cd3559529161d6d12ec0f165e20d9866215ad

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, which utilizes eval() and String.fromCharCode() functions, indicating obfuscated code execution. A critical heuristic identified this as 'Pdf.Exploit.Agent-36086', suggesting it's a known exploit. The primary function of the embedded JavaScript appears to be the download and execution of a second-stage payload, as indicated by the 'Large comment-padded JavaScript eval stager' heuristic. The lack of specific document body text or further script details prevents a more precise determination of the ultimate goal.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `79f307ac1de1a464c4ba6b2edd0155af563a42f2b3ac1fdb17e235b2acae8f35`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627272 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).

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