PDF malware analysis — malicious · da35eeb58dd3a3db

MALICIOUS

PDF

12.5 KB Created: 2009-05-06 06:36:49 Authoring application: KFmVnWboy7Y6X (via mCgsehs)

MD5: ceb7aedecae1a14aa45dd9c9acac1200 SHA-1: 2bb52a577def418e5751f222e6195b6c28d6a691 SHA-256: da35eeb58dd3a3dbdff279f436d2df4f55c6a270e22c4199f563cb34cb42a288

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream, named javascript_obj0007_000.js, is the primary artifact, and its presence suggests the execution of a malicious script, likely to download and execute further stages. The use of unescape() and fromCharCode indicates obfuscation techniques common in PDF-based malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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_obj0007_000.js` `e63bbe426067ba0fc47decff62392defb50c1541d0436874db4421f38200553a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x243	11604 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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