PDF malware analysis — malicious · c681ebb358ac7cb5

MALICIOUS

PDF

9.5 KB

MD5: 93b58bfad17d88854974ac4650bd10ee SHA-1: 092583db12945d16af7721b3ee3f5d12bd8f7b55 SHA-256: c681ebb358ac7cb56dead7d563a7110a283c2de95d1daa6d4f7c4f3e19cd291b

178 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 through the Collab.collectEmailInfo function. This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of multiple deobfuscated JavaScript files further supports the complex execution chain. The ClamAV detection as Pdf.Exploit.Agent-35905 confirms the malicious nature.

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` `c77052a1e80130ac9dddd4bcd2248f53a1be5b2ba17f0e1f22a177b10871d7ab`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12193 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` `8fdfe84237b862b7768cf61851d6652cad0e3047d93f74c848f7364359a80fe5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5155 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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