PDF malware analysis — malicious · c1167b62afa955a0

MALICIOUS

PDF

12.1 KB

MD5: c384d2175c62f0f398db377d5cb3df65 SHA-1: 00a0cb6c22d2a6c455d6e43e911967c65990d6fe SHA-256: c1167b62afa955a054a9264f05c3d567fb3a6490ede750616c2deda2e6436e7f

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability through the `collab.collectEmailInfo` function. This JavaScript is further obfuscated and split into multiple streams, with two deobfuscated streams identified as `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_001.js`. The presence of these deobfuscated JavaScript files and the critical heuristic firing for CVE-2007-5659 strongly indicate that the PDF is designed to exploit this vulnerability to download and execute a secondary payload.

Heuristics 6

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)
ClamAV: Pdf.Exploit.Agent-35903 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35903
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_obj0007_000.js` `860eae5f96eb426380281c575a089242b50523bbb4bbb8dd765e582cd9c07d2e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	294 bytes
`legacy_pdfkit_stage_000.js` `e5d0141ffa542077ec2c65d92d578bbf676f27d034a19dd4e8413e4ba8115220`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	5205 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` `af2cffd1938f528246eb5474463fcb739c511601cf4f9fffc6f537b6a535163a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	12534 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).

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