PDF malware analysis — malicious · 810d4925650962cc

MALICIOUS

PDF

27.2 KB Created: 2010-03-15 23:18:22 Authoring application: v9GOav6xeup6nw (via vi4dSKRzgAssL)

MD5: a38af5bec383acfa1446029754e8d015 SHA-1: d9894288e1123138ccda922b8502b9c17d32897c SHA-256: 810d4925650962cc441adb05e3a8d010955e4263c4dbe2056e614b4d9dcdecc8

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests that the JavaScript is obfuscated and uses `eval()` to execute code. A large JavaScript file was extracted, which is likely responsible for the malicious behavior. The exact payload or download URL is not directly visible due to obfuscation, but the presence of `eval()` and embedded script strongly suggests code execution for a secondary 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` `359f4832d5ecc3ccc84488205a1604bc9d2f761ef40fcb864ae6b88a39c619f8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x240	26642 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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