PDF malware analysis — malicious · 33497a3ddf8ad564

MALICIOUS

PDF

8.2 KB Created: 2008-08-07 19:47:57 UTC Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 977a6a06bd3d416c2a40b7e43256fa63 SHA-1: 6cfa00fd64f3fc9768a02db07d1fb6b64ac96a93 SHA-256: 33497a3ddf8ad564ccb6975c3e87a00c3e4dab984c3e687d4daa67aad306ef3f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscation. The ML classifier strongly flagged this PDF as malicious. The extracted JavaScript file, `javascript_obj0018_000.js`, likely contains the logic for downloading and executing a secondary payload, which is a common technique for initial access and further system compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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)
Suspicious extracted artifact medium 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.
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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `485fe9fa83c08b2dcdad40f3a221094660866c22274165b2b3ee11af27be9ce5`	pdf-javascript-stream	PDF /JS object 18 at offset 0xC21	6279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s). Carved artifact contains 1 long hex-escaped blob(s).

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