PDF malware analysis — malicious · 3fed2588ebeafc1a

MALICIOUS

PDF

118.6 KB

MD5: 6f1caf6a0b2af4f706a8194d29e6499f SHA-1: ab9917790562a509af9f8830366cf366c86ac842 SHA-256: 3fed2588ebeafc1af3e09edede5a71701176153f57fdc1c5fa6b8ef7aa428cb7

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, with multiple heuristics indicating obfuscated code and eval() calls. Specifically, a 'Large comment-padded JavaScript eval stager' heuristic fired, suggesting the script is designed to deobfuscate and execute further malicious code. ClamAV also detected this as 'Pdf.Exploit.Agent-36086'. The primary function appears to be downloading and executing a second-stage payload, as indicated by the script's nature and the heuristic firings.

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` `351694ab38b317af35ce95960d58432745bb35237dbb2e95a7c6de5aaf3c042e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626341 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` `74a723913dca23cad1de1c632b2f8af55c9ce4dcde5bdbe5c1e835d193327047`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 580 long base64-like blob(s).

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