PDF malware analysis — malicious · ef8f72521f9e00ab

MALICIOUS

PDF

37.1 KB

MD5: e697dfa933acd451f435cfe9deee8b9b SHA-1: 7bc0cb40bd2b67952c8fb562357f7c83af2d7e28 SHA-256: ef8f72521f9e00ab163293fbd25a7757eb08a93fcd6fe3a7a3e5e182b01e5a83

226 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript and U3D content, triggering critical heuristics for CVE-2007-5659 and ClamAV detection (Pdf.Exploit.Agent-14145). The primary JavaScript stager, recovered as 'annotation_subject_callee_hex_stage_000.js', appears to be responsible for downloading and executing a second-stage payload. The presence of multiple deobfuscated JavaScript files suggests a complex multi-stage infection process.

Heuristics 8

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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.
ClamAV: Pdf.Exploit.Agent-14145 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-14145
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A4	264 bytes
`annotation_subject_callee_hex_stage_000.js` `010a27f46924356687d1c7e406e86cf630ac68d39327ba1dac6813f31351be82`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x151	5560 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `c4b1bd844d232e7fd1cf4df1118f22e2bb2da90dfa7f872dd360120fb85df2eb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D3	13128 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` `bf1a906a7ff0e87967738909fc26b7666b441d0ea957c069062759d68a6762a6`	deobfuscated-js	PDF JavaScript deobfuscation pass	273104 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00002847.bin` `cffa1d7a24d7b9b42a43d7048cdc78d60069fa1b4ff10ec2aa0d89c3ba9ba702`	pdf-3d-stream	PDF U3D 3D stream at offset 0x2847	27384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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