PDF malware analysis — malicious · 1fc413651af1fe69

MALICIOUS

PDF

5.8 KB Created: 2009-09-05 12:48:00 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 0d268e96190794b308638acc7f1e2e7e SHA-1: 648108b7e47dca104c770cdeca788e84617411b7 SHA-256: 1fc413651af1fe6901581888f53b5bf53669067d270b3e2a291929fc4c4aab52

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'ML_NYX_PDF_MALICIOUS' classifier and 'CLAMAV_DETECTION' with signature 'Pdf.Exploit.Agent-35799' strongly suggest malicious intent. The JavaScript is obfuscated using 'unescape()' and 'String.fromCharCode()', a common technique to hide malicious code. The primary function of this script is likely to download and execute a secondary payload, as suggested by the ClamAV detection name.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35799 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35799
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `0a819308ae03f7987f57eee7d0e79acb1ef4086150d8d0e20da3d386135eaef6`	pdf-javascript-stream	PDF /JS object 13 at offset 0xBFC	10700 bytes
Detection ClamAV: Pdf.Exploit.Agent-35799 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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