PDF malware analysis — malicious · 4effb57a6e380f93

MALICIOUS

PDF

7.8 KB Created: 2009-09-14 19:44:02 Authoring application: Eblasha 9.7.5.5 (via PDF Library 6.6.7.3)

MD5: 7f745e423e4f3c467caad26929e2ed02 SHA-1: 252e9fddfecfab885b57d460a26cdbfcbd6b848e SHA-256: 4effb57a6e380f93a08167e13a99f1718161ddf56c8fe39692c6ac0725ae6d24

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 artifacts, `javascript_obj0015_001.js`, is flagged for suspicious script obfuscation. This points to an attack pattern where the PDF acts as a dropper for malicious JavaScript, likely intended to download and execute a second-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` `a2766c9565e7b41c79cabb95da9d40cbc612fa901c6bdaaf0d361abb56c9ce6c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21244 bytes
`javascript_obj0015_001.js` `1e004e3aaaa45a83f03885db22d8538f90df6b5a2e704511dccc4e2f091beab2`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B3C	196 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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