PDF malware analysis — malicious · ee69e28a93341b93

MALICIOUS

PDF

43.8 KB

MD5: 996e3f721e4e6e67d1b5c0157a21e090 SHA-1: acc0058da4cccc1e935fdc1ded9903c6f5c23329 SHA-256: ee69e28a93341b9384b8b7d8d2aaf66f8d778a285b5444123d47326a067b951a

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file contains embedded JavaScript, which is obfuscated using eval() and unescape() calls. The presence of U3D content and related heuristics strongly suggests exploitation of a vulnerability in Adobe Reader's 3D parser. The ML classifier also flagged this as highly malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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)

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `93f3fdceb942579280d3f196f445d15453064a5ad968d92ae645d590c8b83fa8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	166 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `599f27a30a27fc4c63777cbf75a7b151d9c6ff01fd9b38f3a911de0a686eb7d5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x29F	22683 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `74757747a19cf412aba37915e4c00ccd4f65ff4e27c2745930f979b6e3988cf6`	deobfuscated-js	PDF JavaScript deobfuscation pass	307329 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`u3d_00_off000042e3.bin` `70cf2aead4823e6d2651c9281eed0aa967449da358f439efb9e8e707421175e0`	pdf-3d-stream	PDF U3D 3D stream at offset 0x42E3	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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