PDF malware analysis — malicious · a269bf7a33c29095

MALICIOUS

PDF

7.0 KB Created: 2009-09-13 19:42:92 Authoring application: Eblasha 4.2.2.8 (via PDF Library 4.4.9.1)

MD5: 4ac15289311d024079869d1288212ea1 SHA-1: 47407a2ce8039e96bbdbf90847758a2a5bfdc399 SHA-256: a269bf7a33c290954debc84fcabff78d874ab2a26f4ee9a4eabdfb5ed5ea744c

74 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 eval() call and String.fromCharCode usage within the JavaScript stream suggest obfuscation and dynamic code execution. The primary function of the script appears to be downloading and executing a second-stage payload, as evidenced by the extracted artifact javascript_obj0015_001.js. The PDF structure itself does not provide user-facing content, reinforcing the malicious intent of the embedded script.

Heuristics 6

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` `e01039dc582d55f72cfcd54ac667c8cd978ad3b9c0380ef894014633f47ab0ae`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21439 bytes
`javascript_obj0015_001.js` `65a20eef91c6779bd11d8846c8d28db7cc900ccb84c0e42a0b64dbe20c03e510`	pdf-javascript-stream	PDF /JS object 15 at offset 0x17D3	175 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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