PDF malware analysis — malicious · a011afbc1a7f9653

MALICIOUS

PDF

23.1 KB

MD5: b6b45d4e014e4becca27eab5697dd610 SHA-1: 3a1e9b98819c91c8298765e519ab6e67e844e6d7 SHA-256: a011afbc1a7f965324c74056e637805b547e8d4429f6f4a766f85a4712232ea2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which utilizes obfuscation techniques including eval(), unescape(), and String.fromCharCode(). These heuristics strongly suggest the script is designed to download and execute a second-stage payload. The presence of JavaScript actions and streams within the PDF, combined with the obfuscation, points to a common delivery mechanism for malware. No specific family could be identified due to the generic nature of the obfuscation.

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 0x5A01	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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