PDF malware analysis — malicious · 51983c7b4baaf152

MALICIOUS

PDF

9.0 KB

MD5: 6c230d5f9a20ed1c8ff9f4168a29ec7d SHA-1: 8b8c2a4b0b58341b2153e9f7f52751eb95ec636c SHA-256: 51983c7b4baaf1524444b5c7243eba6a45d88c21a5c2e3c6333c1706a51d7f40

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The critical heuristic CVE_2007_5659 indicates the exploitation of a vulnerability in PDF documents using the Collab.collectEmailInfo method. This vulnerability is known to be used for arbitrary JavaScript execution. The presence of multiple embedded JavaScript streams, including deobfuscated ones, further supports this. The primary intent appears to be the execution of malicious JavaScript, likely to download and execute a secondary payload, as indicated by the ClamAV detection signature Pdf.Exploit.Agent-35905.

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` `066cc68855bc47ae5143ed42303006c6e89b69ca0df549ab7601a3326ab81eb4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11603 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` `0acc38a4a74cbc1915e5c8a1c61a87896fc858af7e3010a1dc53eb7486e21d68`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4772 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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