PDF malware analysis — malicious · 87954b6ec61cf33e

MALICIOUS

PDF

4.0 KB

MD5: 5f09d2db5ecfb3ac4ad8564fbb3fa150 SHA-1: 976a981a95452427bb0817d7614f58a43483070e SHA-256: 87954b6ec61cf33eae7d662941361ffa2eea4a83ebf4757bc3e79a33642e3eeb

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, identified by PDF_JAVASCRIPT and PDF_JS heuristics. The critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER heuristic indicates that the annotation subject is used to launch an evaluation stager. This suggests the JavaScript is designed to execute arbitrary code, likely downloading and running a second-stage payload. The ClamAV detection further confirms its malicious nature. The document body is unreadable, so the rationale is based on the script and heuristics.

Heuristics 4

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.Dropper.Agent-7279414-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7279414-0
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A4	343 bytes

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