PDF malware analysis — malicious · cecdd5c40fd1e143

MALICIOUS

PDF

966 B

MD5: 17a2944afe817481526abd5320ef15c7 SHA-1: 18cc9cd93c49104b67d78972ccb2356a3578a35e SHA-256: cecdd5c40fd1e14337d019692a071478f071449f8a0ce9dc1b2893e446bdb604

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript and JS streams. The JavaScript stream, identified as 'javascript_obj0005_000.js', is likely responsible for downloading and executing a secondary payload. The use of 'unescape()' and 'String.fromCharCode()' suggests obfuscation techniques commonly employed to hide malicious code. The overall attack pattern points to a downloader disguised as a PDF.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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. (matched inside decoded stream)
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_obj0005_000.js` `261a1cac13fff36b0ddf939af39def18480a86e5e931c52f68bc4ae7e5ce1472`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	630 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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