PDF malware analysis — malicious · 85bd615b8877dd38

MALICIOUS

PDF

9.4 KB

MD5: c36f4442558e67ffc7858054703ee652 SHA-1: c1bb01ac2bf6963d22203626e4371b42c9fab793 SHA-256: 85bd615b8877dd38f11d0194d5a4540cc441c690be4f3743bcf78e5e19697d17

208 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 (Collab.collectEmailInfo) to execute code. The high ML classifier score and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is heavily obfuscated but appears designed to download and execute a second-stage payload, as suggested by the extracted JavaScript streams.

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` `1609e3eb296cf060e939142f163dd453a2d407a8731339d5e45354699bf051a4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11957 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` `2d3094e330b20c8efed91de34ee5b58da761a203c5b855f48062543dce9e8ce1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4980 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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