PDF malware analysis — malicious · 37fe81ef289f30fb

MALICIOUS

PDF

16.9 KB Created: 2010-03-11 20:18:24 Authoring application: Tkle9Mfn5c (via BfWlQrijIaL)

MD5: 07601a6cebeadb49fb61b46002af53b7 SHA-1: 11c27fe4018a479d9b8494ddb8b7ae9f6f2111c2 SHA-256: 37fe81ef289f30fbdd5e68290e5182a134405bbd590594c77e7e8f7bd00802b9

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 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 attempts to execute arbitrary code. While the specific payload is not directly visible due to obfuscation, the presence of these indicators strongly suggests the script's intent is to download and execute a secondary stage. No specific family could be identified.

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` `4a3f9717266be33067dddb217dbc6ccd1a34a4a548ba4aef23621fed63597205`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23D	16117 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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