PDF malware analysis — malicious · a47428f3a29e08da

MALICIOUS

PDF

15.0 KB

MD5: f6dc3e30bb2027853659df0a2dc65602 SHA-1: 4fc23df3cbe9498d4a063c995190e2c06d634d2c SHA-256: a47428f3a29e08daeb1f361e1eee6bafa44bd286324b0ed43d7f26dadc6a2f5d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains obfuscated JavaScript, identified by the PDF_JS_OBFUSCATED_DROPPER heuristic. This script is designed to download and execute a second-stage payload, as indicated by the presence of deobfuscated JavaScript files. The ML classifier strongly supports the malicious nature of this PDF. The primary attack vector involves tricking the user into opening the PDF, which then executes the embedded malicious script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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` `1fb082f38589719d49bb0306a9ed09afab399862f7186dc34a8bc73e52886832`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x198A	11848 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` `a3c988230563174aa85cd9edeedded1414f8d90ae5f38d3d146f5977dbbcf07e`	deobfuscated-js	PDF JavaScript deobfuscation pass	58025 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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