PDF malware analysis — malicious · 9443cc4ed332f3ee

MALICIOUS

PDF

20.0 KB

MD5: 215f0961670c33e5fbd81cfff6664ffa SHA-1: 8e320f5674e516863b44acf896c8861972e585e1 SHA-256: 9443cc4ed332f3eed7dc7047dfec434d841d90c6c4eb529f71ba40eb83cb1447

138 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_ANNOT_SUBJECT_MARKER_EVAL_STAGER heuristic suggests the JavaScript is used as a stager, likely to download and execute a second-stage payload. ClamAV also detected this file as Pdf.Exploit.Agent-36065, confirming its malicious nature. The exact intent of the JavaScript is not fully discernible due to obfuscation, but it is clearly designed to exploit the PDF format.

Heuristics 5

Annotation subject percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
ClamAV: Pdf.Exploit.Agent-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
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 exited 1. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A3	431 bytes

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