PDF malware analysis — malicious · 8540ae58f8db18e9

MALICIOUS

PDF

27.8 KB Created: 2010-03-06 11:18:20 Authoring application: LEfutSchHB (via gRgBuUtw)

MD5: 2f3440a9c34bdabfb17aa1d67141afe2 SHA-1: 92f0b7ff17be477af457a8b8a65107317a3414b8 SHA-256: 8540ae58f8db18e9e5fdcc72f1b9304645eb94e7f3fd0a90535923a11b6c660a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL rule firing suggests the script is likely obfuscated and uses eval() to execute its content. This script, named javascript_obj0007_000.js, is the primary artifact. The script's purpose is inferred to be the download and execution of a second-stage payload, a common technique for initial access. The authoring application metadata also suggests a potentially suspicious origin.

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` `d6f2144cb1510d113bf80267ece2291c8f457079893bc40e304ba1fbb5b4d707`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	27257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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