PDF malware analysis — malicious · 8de156a7ba16d540

MALICIOUS

PDF

31.4 KB Created: 2009-12-24 18:42:29 +03:00 Authoring application: sureIn (via cdcfb1c07205f7057b0a305eb21e72d5)

MD5: 2e328572dbdfde0b825478dac0545234 SHA-1: 506058e63a06eb9be8c7fa808c1d33d9cd105d1b SHA-256: 8de156a7ba16d5403a2daee5a948dc49cdf64916b20b62499a05b6515a385535

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL due to an eval() call. ML classification and ClamAV also identified it as malicious. The presence of obfuscated JavaScript, specifically javascript_obj0014_001.js, strongly suggests an attempt to download and execute a second-stage payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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_obj0012_000.js` `976f8af5da046b26cf51bc6d3eea4dc245ec62003750b9395d7102b7ddb3254a`	pdf-javascript-stream	PDF /JS object 12 at offset 0x15C5	36440 bytes
`javascript_obj0014_001.js` `4d703b349fa78c81546521eaf12b1066da49ced05e3721f41ef98affa4063f32`	pdf-javascript-stream	PDF /JS object 14 at offset 0x7327	1348 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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