PDF malware analysis — malicious · f5ccad8a7342a549

MALICIOUS

PDF

2.8 KB Created: 2008-09-24 19:54:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: cf1b7f4bbe2d27fe0de068096b256c9b SHA-1: 7fe5ba18dacb84b041286738340f739c4748b5d4 SHA-256: f5ccad8a7342a549c7f23b0f74964d85807c49f6b0870baa9b9abbe3983fc0d3

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including `PDF_JAVASCRIPT`, `PDF_JS`, and `PDF_EVAL`. The JavaScript stream, identified as `javascript_obj0013_000.js`, is heavily obfuscated and utilizes `eval()` and `unescape()` functions, indicating an attempt to hide malicious code. The ML classifier strongly suggests malicious intent, likely to download and execute a second-stage payload.

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_000.js` `ba925c3f2de9b5783ffbcc0cd3d4babf17c5df2bb90c300de77bcb859660a24d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CD	10383 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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