PDF malware analysis — malicious · a6d5c907378b4d66

MALICIOUS

PDF

118.6 KB

MD5: 0f6b04fe8efeb6be291f4624a0492dbe SHA-1: 1ad4cec90a9a3723cd035050af85322e4a57c6e8 SHA-256: a6d5c907378b4d663186f7caadad00f9145141a2b062d9a40bf34463fedd4af2

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, which is heavily obfuscated and uses `eval()` and `String.fromCharCode`. A heuristic specifically flags this as a 'Large comment-padded JavaScript eval stager'. This indicates the script's primary purpose is to deobfuscate and execute further malicious code, likely downloading a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports its malicious nature.

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` `7ddb0143bc01aed30f03cd3d4e526f308b9097c11df9a43f83ab0a8614527a10`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627548 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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