PDF malware analysis — malicious · b9abeac527b2ea37

MALICIOUS

PDF

9.4 KB

MD5: 5a845efa0bbe5cf800d292b8e159e588 SHA-1: bcc8509e4d79cf3408ac7c7ebf917c4cbefb3840 SHA-256: b9abeac527b2ea37d6ca10b731253a80a0a9141f7a40a84aa59c0baf2281325d

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 (Collab.collectEmailInfo) to execute malicious code. The critical heuristic firing and ClamAV detection strongly indicate exploitation. The deobfuscated JavaScript streams suggest the primary intent is to download and execute a second-stage payload, although the exact URL or final payload could not be reconstructed from the provided evidence. The presence of multiple JavaScript files and the nature of the exploit point towards a downloader or dropper functionality.

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` `cd33f437921dfa6a0b1f36545f54ea55642a7ebb4526cffb91dd2940a700087c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12009 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` `63d39329d98441ef2346bdaa330dfd1253bd7f385db78502b9e45ca76b6455a5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5028 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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