PDF malware analysis — malicious · 55eb9336aaba5e92

MALICIOUS

PDF

12.2 KB

MD5: eab6017d4040cff3f207820572a5234f SHA-1: 7e464664712bd1beda64fc909cc6c112595fdad2 SHA-256: 55eb9336aaba5e9210df044015c46f4949ae5e2d9641c0e2596216686f011d01

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that exploits the CVE-2007-5659 vulnerability using the Collab.collectEmailInfo sink. Static analysis indicates this JavaScript is responsible for deobfuscating and executing further stages, likely downloading and running a second-stage payload. The presence of 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js' further supports this, suggesting a multi-stage attack. The ClamAV detection 'Pdf.Exploit.Agent-35903' confirms the malicious nature.

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` `891ac41638d3713173e9e709977e4f8e6631e25fb5f87b588659df51206f8183`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	5173 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` `c26c088022aae7aab212ddfb2b6eb04cd94b97c4309ef6f6663c372c4e751c05`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	12432 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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