PDF malware analysis — malicious · 4c25693fbbf7a61d

MALICIOUS

PDF

35.5 KB Created: 2010-03-17 01:18:43 Authoring application: B6COjCSRg (via TdiWgl20JEe)

MD5: 172a906d2c4fdc41a2f8040d6ef622b2 SHA-1: eaa118264e3e484c3f9ca0fdbe0dc8c9e66e27f1 SHA-256: 4c25693fbbf7a61d9d34fe115e3889257db64d0ae58e7a2f5aecc08690266136

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 is heavily obfuscated, including the use of eval() and String.fromCharCode(), making its exact function difficult to determine statically. However, the presence of these obfuscation techniques and the high confidence score from the PDF_EVAL heuristic suggest it is designed to download and execute a second-stage payload. 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` `da3defa4ea5cca04254168c87812444e45536a523b567365dbdea2a5b9bf48f2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x244	35156 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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