PDF malware analysis — malicious · a5737919ab87dd4c

MALICIOUS

PDF

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

MD5: dcf2c9db059f3a3c14267242a9efab80 SHA-1: 1c913bdc84ce5845766457c817dd18e05134fa0c SHA-256: a5737919ab87dd4c7fb5b2c7d0d022926593d1aa10f599dbea4065b7861ada0b

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call (PDF_EVAL) and a high ML classifier score (ML_NYX_PDF_MALICIOUS) strongly suggest malicious intent. The embedded JavaScript, extracted as 'javascript_obj0013_000.js', is likely responsible for exploiting a PDF vulnerability to download and execute a secondary payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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` `5302f22b99824ed5145c70ba06fa17ccad3ef4c5061d20f577726b344a52eeb7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	3748 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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