PDF malware analysis — malicious · ee2a2260d38f2d19

MALICIOUS

PDF

15.7 KB

MD5: 9b9e5e3136f02e81a2d68ee2050b08f3 SHA-1: ae74368712a855c1a636b8a4847573b69d4e8363 SHA-256: ee2a2260d38f2d196a697dba5e4bb6c7e07901d7df6cd8dbb18a13e1163d09de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The sample is a PDF file flagged by ClamAV as Pdf.Dropper.Agent-7321378-0. High-confidence heuristics indicate it is an obfuscated multi-stage JavaScript dropper. The embedded JavaScript streams, particularly the deobfuscated ones, are responsible for downloading and executing a second-stage payload, which is the primary malicious intent of this file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7321378-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7321378-0
Obfuscated multi-stage PDF JavaScript dropper high PDF_JS_OBFUSCATED_DROPPER

PDF JavaScript shows 3 independent signals of exploit-kit-style multi-stage obfuscation: annot_subject_stage, hex_dashed_payload, repeated_pluginschk. This is strongly consistent with pre-2011 Adobe Reader PDF droppers — OpenAction JS reads encoded data from annotation subjects, decodes it through one or more hex / base-N loops, and invokes eval indirectly (method name built one character at a time). The actual CVE is hidden in the final decoded layer and is not visible via static analysis.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `a3319192cac6d4dc4eeb6af2d736b0ffec979b23116a003bc7c23382761c32a5`	pdf-javascript-stream	PDF /JS object 5 at offset 0x148	733 bytes
`legacy_pdfkit_stage_000.js` `0e400eb16a7676c9a1e7169207a95ba60e640e0062eeb24c246e02a1a022a5d5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1ABB	12484 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).
`deobfuscated.js` `001b36888c595c104c2bc9791acddc91a5e5ee9b055d2383da6538c87848f69e`	deobfuscated-js	PDF JavaScript deobfuscation pass	59986 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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