PDF malware analysis — malicious · 84aff23dc8351f67

MALICIOUS

PDF

7.0 KB Created: 2009-09-11 19:45:47 Authoring application: Eblasha 6.10.1.6 (via PDF Library 8.9.8.5)

MD5: 4224c63b1b63baac885e767c8d343a38 SHA-1: af5b67b2b02e5ef3e88f86ecbeb1b9f734e97cfc SHA-256: 84aff23dc8351f67abec98f456ad44c218b55b37d0cd80ea6be6b571f2c5cd0a

74 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 eval() call and String.fromCharCode usage within the decoded stream suggest obfuscated code execution. One of the extracted JavaScript files, javascript_obj0015_001.js, is flagged as suspicious due to script obfuscation indicators. This points to an attack pattern where the PDF acts as a dropper for malicious JavaScript, likely intended to download and execute a further stage payload.

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` `2a34859841ee60a95917d3dfb9a7051835eea99dfcf5abfdde4f656e5775e4b0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21149 bytes
`javascript_obj0015_001.js` `7b9b2524656fd271c31f2868bd40761b6266eaaf322c6a0d5b10bdf1e3c24b69`	pdf-javascript-stream	PDF /JS object 15 at offset 0x17C6	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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