PDF malware analysis — malicious · c84cd3c89a266855

MALICIOUS

PDF

12.7 KB

MD5: fc3873093a27b9c3dfbf91006e0399b0 SHA-1: d89b03d96f9400da10972eaa315e9a6f68b5f60b SHA-256: c84cd3c89a266855f624d753a1ae45c56cd32814c3ad5eab28133914d7b292dc

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2007_5659 heuristic indicates the exploitation of a known vulnerability (Collab.collectEmailInfo) to execute this JavaScript. The extracted JavaScript files (legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js) are likely responsible for downloading and executing a second-stage payload, as suggested by the ClamAV detection (Pdf.Exploit.Agent-36062) and the suspicious extracted artifact signals. The file's SHA256 hash is c84cd3c89a266855f624d753a1ae45c56cd32814c3ad5eab28133914d7b292dc.

Heuristics 5

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-36062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36062
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.
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` `068944f8c011a88ab770b45c6de142b9305a1f515d410204d5eadd9ac2b5bfb3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	373 bytes
`legacy_pdfkit_stage_000.js` `713e1010164f802a8afebddb8173b0e6d67040a16290c449d81de198277e5e1e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12360 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `7ed5fed619caf92ae5fdae1e995a3467f1f6bc8bcbca13742f77217f7ccc1161`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5101 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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