PDF malware analysis — malicious · 4c6d1802d9e0758e

MALICIOUS

PDF

4.6 KB Created: 2008-31-20 53:85:00 Authoring application: 1678 (via 1678 4.3)

MD5: a537aa5230127c8beda3d539d559a0a1 SHA-1: 3b4a3d6cccef01c5c20443d3400ee4c912c0d496 SHA-256: 4c6d1802d9e0758ec68730b2d5ca7708510de5af58d3c8cdccd4338c97b12121

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, which is heavily obfuscated using `eval()` and `unescape()` calls. The ML classifier strongly indicates maliciousness. The presence of JavaScript and obfuscation suggests the script's purpose is to download and execute a second-stage payload. No specific family could be identified due to the heavy obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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_obj0013_001.js` `814fc4bddef9fc4f1ab5f61a4ee4ac07ca6b21ae52ca8db295eae4077478b63a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	72754 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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