PDF malware analysis — malicious · b696a30ba5d63273

MALICIOUS

PDF

23.3 KB

MD5: b6f181f38d6e69748571118cb3a926b9 SHA-1: 72929e36f70ce1993f9bce635ef125ed662a0c8c SHA-256: b696a30ba5d6327341a27d78f0f74eba61d67be1f291a7a06a69f55f8078152b

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded, obfuscated JavaScript. Heuristics indicate the use of unescape() and String.fromCharCode, common techniques for hiding malicious code. The JavaScript stream, named 'javascript_obj3332_000.js', is likely responsible for downloading and executing a second-stage payload, which is a common attack vector for PDF-based malware. The exact payload and download URL could not be determined due to obfuscation.

Heuristics 7

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` `cb9b9d25fac45af8acf5581013b50b83ff981546116f35d9f693d8edc7b732ff`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x5A1D	482 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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