PDF / .TXT malware analysis — malicious · a7b9170491814443

MALICIOUS

PDF / .TXT

6.7 KB Created: 2009-11-17 23:22:12 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 5aee0789c4714509f38080cb6ac50f28 SHA-1: 645ef85377c4bfcf0a53d15955fe8e5c4f620093 SHA-256: a7b9170491814443fb14147072c401c93819172b5bb8414ba863a7d92bff312c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream is obfuscated, as suggested by the PDF_UNESCAPE and PDF_FROMCHARCODE firings, and a suspicious extracted artifact named 'javascript_obj0016_001.js'. The obfuscation makes it difficult to determine the exact payload, but the presence of JavaScript within a PDF strongly suggests an attempt to execute malicious code, likely for downloading a second-stage payload or exploiting a browser vulnerability.

Heuristics 5

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_obj0016_001.js` `afc27af558978503c42c7af34db917e6c22ab94b327d8a65e88d349e11d6f1d9`	pdf-javascript-stream	PDF /JS object 16 at offset 0xC9A	12549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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