PDF malware analysis — malicious · bbf9b5aef225321f

MALICIOUS

PDF

4.3 KB

MD5: 78cb3e46952c4319564886de88371071 SHA-1: 63338d7216f8ac9be60197c359a057ce87aac4a7 SHA-256: bbf9b5aef225321f14174f1c33ff90088ba500e37da85e3d4133a839309afd61

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests that the JavaScript is being used to execute arbitrary code, likely to download and run a second-stage payload. The presence of `eval()` and `String.fromCharCode` in the decoded stream points to obfuscated JavaScript execution. No specific family could be identified, but the technique is common for initial access.

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. (matched inside decoded stream)
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_obj37845_000.js` `fe7674d7cfc8c3e6e14f194fd802f109b892dc9d5abca47e1d870fe6d185c1ef`	pdf-javascript-stream	PDF /JS object 37845 at offset 0x137	8304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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