PDF malware analysis — malicious · d4a1c944f3a3ba8d

MALICIOUS

PDF

21.1 KB Created: 2010-03-16 02:18:36 Authoring application: ajh2kNdaZfVu (via Ynk6Z)

MD5: 3c17b4caa3f69cadf9fd08381b6c00d7 SHA-1: fbdf886fb6003834d8fc8f1e6c7b94ffd3d7fb75 SHA-256: d4a1c944f3a3ba8d706836944ac997b9d3ee2ff1c53332bd627a7eb11789cd43

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 utilizes `eval()` and `String.fromCharCode` for obfuscation, a common technique to hide malicious code. The primary heuristic firing is PDF_EVAL, suggesting the script is designed to execute arbitrary code. The extracted artifact `javascript_obj0007_000.js` is also flagged as suspicious due to script obfuscation. The likely intent is 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` `612331c5fb1b7abc7823d124916ad8f81847bab0c9ce6b8a897928a0d1769496`	pdf-javascript-stream	PDF /JS object 7 at offset 0x240	20375 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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