PDF malware analysis — malicious · 2278849c18d24d8d

MALICIOUS

PDF

7.9 KB Created: 2009-09-25 19:42:10 Authoring application: Eblasha 7.7.1.9 (via PDF Library 7.1.6.5)

MD5: b536ac393b4d99d4bc56644d0cd7407b SHA-1: 56f9f75c2af706f30cc2798ab740efc7b4fd4c9e SHA-256: 2278849c18d24d8d203ec69b89c70ffab66b23bd55e9ee1258a3a568800015a6

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The file is a PDF containing obfuscated JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript, likely responsible for downloading a second-stage payload, is the primary attack vector. The presence of `eval()` and `String.fromCharCode` suggests heavy obfuscation within the script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7238926-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7238926-0
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. (matched inside decoded stream)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `a7750b4df4534a11f6b14dfb277138d520ac90dbc13f06590d03536afdee34ff`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21199 bytes
`javascript_obj0015_001.js` `d6d748a2bdf0922d0e5fe69de373051ed220b3e3c8c5d0270b288bc4cdd25ce7`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B52	184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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