PDF malware analysis — malicious · 24777a24ec98b388

MALICIOUS

PDF

118.4 KB

MD5: cf4d0d80081162552d9affddc68f3e05 SHA-1: 458af35fc3154d91b39c5449bb87fbd169b22309 SHA-256: 24777a24ec98b38854e951381b5c255c4bf2184446329551459370dfbb57a346

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, with heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscation and execution of malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly indicates a known exploit. The presence of large JavaScript streams and the 'Large comment-padded JavaScript eval stager' heuristic point towards a sophisticated stager designed to download and execute a second-stage 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` `3624d8ed875986e659d8235ad4b3983db80423d580af198ad566569ea3cd236b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626522 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` `798e6acb20161a797b478723ff464488ce1dc06eb01d746159526084a24b9d34`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 593 long base64-like blob(s).

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