PDF malware analysis — malicious · 33d19c827f186a7b

MALICIOUS

PDF

9.2 KB

MD5: 6a47c5d3351fd222ee39fb401877540b SHA-1: 325bafe80b5e6615d8a43f230cfc96ffe0b430a5 SHA-256: 33d19c827f186a7b860c749d58a9ffa792dcae94e82f7d8da926e3460a8a3d71

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object

The PDF file contains embedded JavaScript that utilizes the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. This JavaScript is heavily obfuscated but appears designed to decode and execute further malicious code. The presence of multiple deobfuscated JavaScript streams and the ClamAV detection strongly indicate this is a malicious PDF exploiting a known vulnerability to deliver a payload.

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` `1e9a0a3787ab7e4b21cf82dcc3480262d1d9ffa495fd20c61a22ed93abd8eb6f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11744 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` `fdb93858488516915a46d27be61a1ce82f7ebe90411ec962f62155ffd9b07597`	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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