PDF malware analysis — malicious · 1aa8abf07194fdbf

MALICIOUS

PDF

55.5 KB Created: 2009-03-08 17:44:02 Authoring application: a3D5HemX (via GybRi)

MD5: c52c70808d99545bb04f48c7ea1d9f42 SHA-1: bf2f5f4408edaedfd51a7b0eaf4e902c733919bd SHA-256: 1aa8abf07194fdbf578cc2d40110f8e7500eb0b96fce3bfee5dedfeb8525e49e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`. A high-confidence ML classifier also flagged the PDF as malicious. The primary heuristic indicates the presence of JavaScript actions and embedded JS streams. The extracted artifact `javascript_obj0007_000.js` is the likely source of the malicious script. The script's obfuscation and use of `eval()` suggest it is designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
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` `666bee21c0c84d8d85bac615c888ada11f953bdec84e2156c4b63da0433fd10d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23B	55522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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