PDF malware analysis — malicious · 5116a7a54498180e

MALICIOUS

PDF

5.1 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: c03036b2e1ef2228d82d7846eb461e21 SHA-1: 4f34d2f2a33ba11aaef7c93a7c88ae0df2a2351b SHA-256: 5116a7a54498180ec9990d8032bf5ee88f6d145aa87019a6f13979d4713fa6a5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. High-confidence firings like PDF_EVAL and ML_NYX_PDF_MALICIOUS indicate malicious intent. The ML classifier's output of 0.999991 strongly suggests maliciousness. The presence of obfuscated JavaScript streams, specifically 'javascript_obj0013_001.js' and its deobfuscated version 'acroform_b64_00.js', indicates the script is designed to execute arbitrary code, likely to download and run a second-stage payload. The confidence is slightly reduced due to the inability to reconstruct specific URLs or commands from the obfuscated script.

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)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0013_001.js` `26191edb3909e484d8c439c642829373c6f3f73f99848e33a939b0cb9eff0e1c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x366	6551 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `628b3187cd946b8f6fdf8f3e3107343b30a3e1548031a24f5346551fb0fe31ed`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x704	4255 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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