PDF malware analysis — malicious · a9b5bf75e5a37228

MALICIOUS

PDF

26.9 KB Created: 2010-03-10 11:18:29 Authoring application: IeIeHsJ65y (via k3BG9Lz)

MD5: 3205f12ab37b092fdec4a900f3199147 SHA-1: 4d5a3cbc947615cfc039e4d49e4c85c7afa28b33 SHA-256: a9b5bf75e5a37228103e32c7b3750861cda7cc7bbd7a3576fcf74e6fc5013f13

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 uses `eval()` and `String.fromCharCode` for obfuscation, suggesting an attempt to hide malicious code. The primary heuristic firing is `PDF_EVAL() call`, which is a strong indicator of malicious intent. The extracted artifact `javascript_obj0007_000.js` is also flagged as suspicious due to script obfuscation. The overall pattern suggests the JavaScript is designed to download and execute a second-stage payload.

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` `f49a352e813b6d4f957f901223d50abbd54980dc881c98777e4d41cf761d9bb8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	26333 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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