PDF malware analysis — malicious · f1c956e8ba210a65

MALICIOUS

PDF

4.5 KB Created: 2008-31-20 53:85:00 Authoring application: 838 (via 838 3.1)

MD5: 0b03c1c04ae61ea4c7ff52945c057eef SHA-1: 82bbfdfffcf1acf94ede224ec2b3986456b72ba5 SHA-256: f1c956e8ba210a656f4ee5aaaf2b9188edb4629e2ad433816b3d9fd6088d1360

128 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The JavaScript stream, identified as 'javascript_obj0013_001.js', is heavily obfuscated using `eval()` and `unescape()` calls, suggesting it's designed to download and execute a second-stage payload. The lack of specific IOCs beyond the script filename limits further attribution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `fa61444de15402d84b7b1afa8d37ef2bf2c3c18d9e94fbfcca5bb14c48bad6d1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	69842 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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