PDF malware analysis — malicious · 3b3617b67a21d20f

MALICIOUS

PDF

16.8 KB Created: 2010-03-16 15:18:36 Authoring application: crRo9A (via GYvTM)

MD5: 4ea469f83b790a233e030234e21b51fa SHA-1: 50b0203afe117bf266dfadebba57a222d3b3fde2 SHA-256: 3b3617b67a21d20f64bdbdbbe8cba58482dc985028d7fd99f843a81627ed4551

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 for malicious scripts. The primary intent appears to be the execution of arbitrary code, likely to download and execute a secondary payload, as suggested by the suspicious extracted artifact `javascript_obj0007_000.js`. The obfuscation makes it difficult to determine the exact payload or destination without further dynamic analysis.

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` `864c0226ee050b6a14b30b8a963e7679f8133178738ffacb4d88afe3b64ea826`	pdf-javascript-stream	PDF /JS object 7 at offset 0x248	15937 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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