PDF malware analysis — malicious · 956d098706bb84b9

MALICIOUS

PDF

23.0 KB

MD5: 4489d9e7c523c97490679bdc7b938579 SHA-1: c57a345508a3163399b9a8dd4b5e4bdf98d283ad SHA-256: 956d098706bb84b9166aeeaa59391a259306a32b0e39c5a54ef38c693f0ff558

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious JavaScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, PDF_UNESCAPE, and PDF_FROMCHARCODE. The JavaScript stream appears to be the primary mechanism for executing malicious code, likely involving obfuscation techniques like eval() and unescape() to hide its true functionality. The extracted artifact 'javascript_obj3332_000.js' further supports the presence of embedded script content. The overall attack pattern suggests a malicious PDF designed to exploit vulnerabilities or deliver further payloads via JavaScript execution.

Heuristics 8

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `a105524e6b35a3c7073fa1b7ddac1213d09b678be79c3d2a6932bf8e2a597a30`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x596B	312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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