PDF malware analysis — malicious · 4b211796bedca480

MALICIOUS

PDF

9.5 KB

MD5: 85e848d7abf2e00c198b572f11da3d5c SHA-1: d9da59e116a84f0b6fcf0c683f91a7144a2347fc SHA-256: 4b211796bedca480275b7443f5dc5c2eb673f8f6d4f37bc3f0ed0297b428ba55

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The critical heuristic firing for CVE-2007-5659 indicates that the PDF document exploits a known vulnerability to execute embedded JavaScript. The presence of multiple JavaScript streams and the use of unescape() further support this. The ClamAV detection as Pdf.Exploit.Agent-35905 confirms the malicious nature. The script's likely intent is to download and execute a second-stage payload, although the exact URL or payload is not directly extractable from the provided evidence.

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` `cbe381ad385600adea713bea6e64ff9d8ead1da4c4cd488e614521b7bc821774`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12131 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` `2f5ec2830fe28d94193bfe9efc36f58128b9da7179e4b90e0c8a67ff608d0e9b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5108 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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