PDF malware analysis — malicious · a457ea235cbdc183

MALICIOUS

PDF

9.4 KB

MD5: 025e6cae8688143c5e9440a0e97d5502 SHA-1: b750446e7a601fc6f3a71c1a867a894038aa7f01 SHA-256: a457ea235cbdc1831022afde803e420e8badb83cef209815cfcf59ed3da64470

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File T1071.001 Web Protocols

The file is a PDF containing embedded JavaScript, which is heavily obfuscated and utilizes the unescape() function. Critical heuristics indicate the exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method, a known technique for executing arbitrary JavaScript within PDF documents. The embedded JavaScript is likely designed to download and execute a second-stage payload, as suggested by the ClamAV detection name 'Pdf.Exploit.Agent-35905'. The document body is unreadable, but the technical indicators strongly suggest a malicious exploit delivery mechanism.

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` `168e2c496305020740bf7383e019749d2b2f6da5d91d8d9f62ddf8c5b9b59c1b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12000 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` `119e73b44f37bdf26d24c16f4c502b757150354e10b5f910e81a646ac20783d1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5057 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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