PDF malware analysis — malicious · 981632736fc4addf

MALICIOUS

PDF

12.1 KB

MD5: 9b9ee850158eaa798adc51297562fef5 SHA-1: 367ed547f8176419c6d65764c9e4ec34aafbf1d7 SHA-256: 981632736fc4addf1ace1c5aa6b44235108a2ad482aea3c22d56f7a097184630

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, identified by the CVE_2007_5659 heuristic, which is designed to exploit a vulnerability in Adobe Reader. The embedded JavaScript streams, specifically 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', likely download and execute a second-stage payload. The ClamAV detection 'Heuristics.PDF.ObfuscatedNameObject' further supports the malicious nature of the file.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `6f60a1053baafdc578f85eae84a2dc6d16775fbd66240d82cbfb7b4f4ff4e90a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	295 bytes
`legacy_pdfkit_stage_000.js` `6259d883b8dee319022e16903cdab1e8db0bc9f9d7b2cef0f4e8ae93804f3006`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	5118 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` `ce526332b70a1c85052452a2ec85fc7de866abf9e1381f55eced65e5ec9ad1d2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	12307 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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