PDF malware analysis — malicious · db4debda7f8dd48e

MALICIOUS

PDF

7.9 KB Created: 2009-09-15 19:43:28 Authoring application: Eblasha 7.4.2.7 (via PDF Library 3.6.2.7)

MD5: 8ffa5ab360ce930bf7f0be67fe067725 SHA-1: 44a4b7e303e5a4b842a6789e5404bc6e650e62e2 SHA-256: db4debda7f8dd48e2905ea81641b2fd958a944e0cfea967d88da174555ff4d0c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ClamAV detection of 'Pdf.Dropper.Agent-7312121-0' strongly suggests malicious intent. The JavaScript is obfuscated, making its exact function difficult to determine, but it is likely responsible for downloading and executing a second-stage payload. The presence of 'eval()' and 'String.fromCharCode()' further supports the execution of dynamic code.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7312121-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7312121-0
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` `b61ece9415d32c30e9109f3c01aa2017adc055428905aa980e15ee582271588e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21337 bytes
`javascript_obj0015_001.js` `b4f45de99cf4729188f746bf749560ef6886723a28ae27be4058a0b79f0674ef`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B82	187 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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