PDF malware analysis — malicious · d172e934881f7d69

MALICIOUS

PDF

9.2 KB

MD5: 3cfabe8eb160f37467515d1d4894df5a SHA-1: 4d391353cbd12f95784bc9a39b830e3ab619a8b4 SHA-256: d172e934881f7d699fa2f21357b0bd5b2f282490a12cc44a6ffefa20a827ddd5

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF document that contains embedded JavaScript, which is triggered by the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The critical heuristic firing and ClamAV detection indicate malicious intent. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload, as suggested by the deobfuscated JS streams. The exact nature of the payload cannot be determined 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` `94916c3de629f93ad8e3c6f2e1d4161514b0336f382c3806a42752ab9077b920`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11802 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` `c1c404fc4dad59871d6aa7e1ffa05db345114b17b6ca5d7bf804b0b505756a27`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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