PDF malware analysis — malicious · b998d3a38800a6dc

MALICIOUS

PDF

12.1 KB

MD5: 2701c80767f29e279c684ac041761fd1 SHA-1: ca560ebe4f49a8714a39ce3cc2e3e30f72e70b1d SHA-256: b998d3a38800a6dcefac2ade506075cc0ab935ac943f5d55738730b7bde25dbe

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 deobfuscated JavaScript streams (legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js), indicating a multi-stage download and execution process. The ClamAV detection further confirms its malicious nature. The exact payload and delivery mechanism are not fully discernible from the provided evidence, hence the 'unknown family' classification.

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` `8a75053332eb58c9c8def4cd3c1de6759f71755926b09c4722d5bcda4e2e4d99`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	5158 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` `de47134462e0464de8f82e7886b9d8f2842dc908196eb1f2c3b038cdbe06f0de`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	12200 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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