PDF malware analysis — malicious · 8348e1905f4e66fb

MALICIOUS

PDF

3.7 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 9f94eefa44bc464e02929c86deb8aa6a SHA-1: 84cd5f898a8f31c4ee93b8584638145ea14272ec SHA-256: 8348e1905f4e66fb8ba192b192e90b264007b65a9f6b5753fa528ab7ce55c7cf

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ML classifier strongly indicates maliciousness. The JavaScript stream, though obfuscated, utilizes eval() and unescape() functions, suggesting it's designed to decode and execute arbitrary code. This pattern is commonly used to download and run second-stage malware. No specific family could be identified.

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_obj0014_000.js` `6e1023b0875ce7545f86c3060724502ff1de908d51041225ae004724f79abf75`	pdf-javascript-stream	PDF /JS object 14 at offset 0x368	21835 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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