PDF malware analysis — malicious · c407d8eb6b473ca2

MALICIOUS

PDF

43.7 KB

MD5: e9bce537c7ff4fdee2c21d4be1979749 SHA-1: 14b888299ddf38e0ade121e821255ad34ec4c90b SHA-256: c407d8eb6b473ca2ebad7ffde9868411de972109104219eb4ff180361272e264

136 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, which is designed to download and execute a second-stage payload. The presence of U3D content and multiple JavaScript streams further indicates malicious intent. The ML classifier strongly supports the malicious verdict. The extracted artifacts 'deobfuscated.js', 'legacy_pdfkit_stage_000.js', and 'u3d_00_off00004267.bin' are direct results of the analysis and likely contain the malicious components.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `a2765ef4bc176af71164210608f93ccd0cfd1d5803648c48f5d630ef03f5faa9`	pdf-javascript-stream	PDF /JS object 5 at offset 0x14F	749 bytes
`legacy_pdfkit_stage_000.js` `58634a8703172eb8eb3916c088f05d1615e292edb4a6a030f9b7e21140c6a9d7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1C62	13375 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` `46084ad0801e739befb57c54df2bfed4f913835869271878e8f1ed3e534afd9d`	deobfuscated-js	PDF JavaScript deobfuscation pass	209497 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00004267.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4267	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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