PDF malware analysis — malicious · b323ad06694810ba

MALICIOUS

PDF

49.9 KB Created: %SkbgYLcCo0t2Pu3IKyQanZ9srz6HBUdEeVMFhNDJ4lWjOw8pAG7Xm51qRfiTvx Authoring application: Creator

MD5: 847b152c08dec8b55560661875cf2e54 SHA-1: 7e0bed74c82f1197cb77af22746f1ac66d8a61f9 SHA-256: b323ad06694810ba5201b3fb8719da724b291cf53e4ede9c75a7e68d268639a2

60 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 PDF_UNESCAPE heuristic suggests that the JavaScript is obfuscated using the unescape() function. The extracted JavaScript file, javascript_obj0018_000.js, is likely responsible for downloading and executing a second-stage payload. The obfuscation and the presence of JavaScript point towards a malicious document designed for payload delivery.

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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0018_000.js` `210fda308a1e3af0e3ba9dfd7cb0ba16a394fd329e0ceff38fc886b9e6d2a10c`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	24974 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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