PDF malware analysis — malicious · fb4bf4e7759e3b85

MALICIOUS

PDF

13.0 KB

MD5: 1229518521cc8dab4a5634f41156a91e SHA-1: 3475fabaceaa50682d99a3a118a446d415149410 SHA-256: fb4bf4e7759e3b8534ebc8e3c600626691f9f8bb029bf8f26fd9bfbd36ebea07

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. This JavaScript is further obfuscated and split into multiple streams, indicating an attempt to evade detection. The primary goal appears to be the execution of a secondary payload, as suggested by the deobfuscated JavaScript files.

Heuristics 5

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-36062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36062
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` `068944f8c011a88ab770b45c6de142b9305a1f515d410204d5eadd9ac2b5bfb3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	373 bytes
`legacy_pdfkit_stage_000.js` `f2e1cfba308575dcafbb91fa7ca2ca483496e4e1b9c90f66bbdedac8a9ad09b4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12660 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `c4b2998e882e42cf6c4edce66d99b111d024563a96666ad37ddc3a83c7705d10`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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