PDF malware analysis — malicious · 578cafb33a788f42

MALICIOUS

PDF

7.9 KB Created: 2009-09-12 19:46:12 Authoring application: Eblasha 5.1.8.1 (via PDF Library 5.7.1.4)

MD5: 596ebfde3441bf875d3acd0f4d752297 SHA-1: acf1288e5c93571db49b131b632627a6286328ad SHA-256: 578cafb33a788f42ec359ac648c9efbd5b223a2aef1a977311a8575ae3e59bcc

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ClamAV detection of 'Pdf.Dropper.Agent-7262394-0' strongly suggests malicious intent. The JavaScript is obfuscated, making its exact function difficult to determine, but it is likely designed to download and execute a second-stage payload. The presence of `String.fromCharCode` and `eval()` calls further supports this.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7262394-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7262394-0
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` `6adc8e4ac23fab7d469b6aa243a3e36c6af825dcc746e22887b8197ac68fc7e6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21174 bytes
`javascript_obj0015_001.js` `92a8343da2a0df29673f226618498f6a2f72f6bc858d18b54054e3de13939e51`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B50	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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