PDF malware analysis — malicious · 1e35da5483f6f04e

MALICIOUS

PDF

9.4 KB

MD5: 573bf127b297f1874c2a2c93c5569626 SHA-1: 6f24e8f066d27d21a0cf0cde90f930b21e0c7a01 SHA-256: 1e35da5483f6f04e12513e50b9b27480cd08c19f9b2e3b78507b645dec13deac

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1059.007 JavaScript

The sample is a PDF file that contains embedded JavaScript, which is a common technique for exploiting vulnerabilities in PDF readers. The critical heuristic 'CVE_2007_5659' specifically indicates the use of the Collab.collectEmailInfo method, a known exploit vector. The embedded JavaScript streams, particularly the deobfuscated 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', likely contain code to download and execute a second-stage payload. The ClamAV detection further confirms the malicious nature of the file.

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` `66fc0bfd5aa1a41a0e5924fe88ea304d99cbc59e26f7a418f09299bfaad4468b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12047 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` `30f06985676e7651cf1e96465efd9afd294d8438d32b761c97e9b538c9435640`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5067 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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