PDF malware analysis — malicious · 8e55769e5265d66f

MALICIOUS

PDF

9.6 KB

MD5: ada2910117f4ee7e7af69ecd9ff23fdd SHA-1: e8df05aee69f9124d4bec2637de1f7bef9c008c9 SHA-256: 8e55769e5265d66fc79ee9075bebaca4c711d3307df60381df3bc7b6aef75a04

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The critical heuristic CVE_2007_5659 indicates the exploitation of a known PDF vulnerability using JavaScript. The presence of multiple JavaScript streams and a high ML classifier score further support this. The embedded JavaScript likely downloads and executes a second-stage payload, as suggested by the deobfuscated script sizes and the ClamAV detection signature 'Pdf.Exploit.Agent-35905'.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d36789ea108a72817fd104a28b6e3b7742647c2b0f8b4c4e9ffbc3a852304322`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12265 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d91cb91f36283f9325db270739d001f6a92290c2aa1587f1731056afa081c87b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5151 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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