PDF malware analysis — malicious · 9037e899e477d6e7

MALICIOUS

PDF

7.9 KB Created: 2009-09-15 19:48:89 Authoring application: Eblasha 9.9.5.6 (via PDF Library 9.6.5.8)

MD5: 3d4da3b14186de81b79b7c8a44c313e3 SHA-1: 8f8a41bebe02b729689845264470331e31bff7c3 SHA-256: 9037e899e477d6e77acb24d29d2cd64c0302040d39171f9333d3b283f5691446

134 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_EVAL. The presence of `eval()` and `String.fromCharCode` suggests obfuscated code execution. ClamAV detection as 'Pdf.Dropper.Agent-1828850' strongly suggests a dropper functionality, likely downloading and executing a second-stage payload. No specific family could be identified.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-1828850 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828850
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` `403726e28dc388fa74b95172bfa4071f6042c1258b34f721df6fd7d9655cbe78`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21263 bytes
`javascript_obj0015_001.js` `0bf0f7898e5a1360c22bf5d9767af6cfae1563554eb0c56a75e41b401e6e5c04`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B63	208 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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