PDF malware analysis — malicious · 440535fb7531867d

MALICIOUS

PDF

28.3 KB Created: 2010-03-06 17:20:29 Authoring application: s637JBOD (via esiWlDAniV)

MD5: 949f4a1d12d1605ffef49416f0eb5a33 SHA-1: 92bbc166d72d67790fca8364e12d706d47f691ad SHA-256: 440535fb7531867d155013d0d8f9577cdd243d0ecc7713787cc7739e00526326

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, utilizing String.fromCharCode and eval() calls, which are flagged by PDF_FROMCHARCODE and PDF_EVAL respectively. This obfuscation suggests an attempt to hide malicious functionality, likely to download and execute a second-stage payload. No document body text was available for analysis, and the extracted script is too obfuscated to determine its exact function.

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` `3a68342406b5c96ed4433bf33f35d9449c2484e4c11a54cc830ec6a6afa1c40d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	27730 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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