PDF / .TXT malware analysis — malicious · 384d8b8ba510fd25

MALICIOUS

PDF / .TXT

12.1 KB

MD5: b175527038eaae7fb0a16e4634fd2168 SHA-1: 502632f296da3b68bb52b69a01710c91f09cf08a SHA-256: 384d8b8ba510fd2539fac360187a99491ccff1e11c6fcef093c9fcaaf5fee8bb

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, specifically targeting the Collab.collectEmailInfo function. Static analysis recovered obfuscated JavaScript streams, identified as 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. These scripts are designed to download and execute further malicious content, indicated by the ClamAV detection 'Pdf.Exploit.Agent-35903'. The attack pattern is consistent with exploit kit delivery mechanisms.

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` `9d84a0c4b3a56adf4e35f12c115002aa7ff2960d42c9a5fd4862719ad1765cb2`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	5103 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` `5fa0a04fe490de3b683ad66ee616ce2b510ce238395b7257479c31f12d39f40b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	12130 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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