PDF malware analysis — malicious · 9cf70a9a80c29316

MALICIOUS

PDF

9.2 KB

MD5: b849d2609795993434b8966e0d295a4f SHA-1: df3ae5e9365d6064f1dc4221572a7b53335c1340 SHA-256: 9cf70a9a80c29316d6cd813613ae7600a02b090beb77779a4c0ab249f0d262b9

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, which is flagged by multiple critical heuristics including CVE-2007-5659 (Collab.collectEmailInfo). The JavaScript is heavily obfuscated but appears to be designed to exploit this vulnerability. The extracted JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are large and suggest complex malicious activity, likely involving the download and execution of a second-stage payload. The ClamAV detection further confirms its malicious nature.

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` `fd99fe8468950a62a361a0d2ab0e663a22ee47e72275b67f2d762fda2e6c92e4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11722 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` `6d7f62464fd0b76c594c9ef1c103d75c33dbd170455e1ea2c33e03f07fbfff4d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4937 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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