PDF malware analysis — malicious · ed99ad1f2b412667

MALICIOUS

PDF

28.3 KB Created: 2010-03-16 11:18:28 Authoring application: XxF7lmMawW (via yiRYS6WjA2R)

MD5: 8d54302b574a4d000a2c1b0ecb4d479b SHA-1: 3663362fade6bce586d00f8e9698f4d3b0632ccf SHA-256: ed99ad1f2b4126679e2fdf3afb5e28f61d7301973bb6f085dfe79d5ff6979de3

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing `eval()` and `String.fromCharCode()`, making its exact function difficult to determine statically. However, the presence of these indicators and the extracted artifact `javascript_obj0007_000.js` strongly suggest that the script is designed to download and execute a second-stage payload. The high `unknown_exploit_score` further supports a malicious intent.

Heuristics 5

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `139341c1b04727403c20cd46ee9d326096c7c1cf1220ddf8dbb07d3831892564`	pdf-javascript-stream	PDF /JS object 7 at offset 0x244	27749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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