PDF malware analysis — malicious · fb338fe496660bc8

MALICIOUS

PDF

11.8 KB

MD5: bdb6ac3f9b28a5ddbd0f79be935d0552 SHA-1: 427707b3545fba4811f41e13c3836dc6b20a21b6 SHA-256: fb338fe496660bc8d57e0c8663cd73009f3eec6499653b07bc67ebb817c5f017

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, identified as malicious by ClamAV and exhibiting characteristics of exploit kits. Specifically, the CVE-2007-5659 heuristic indicates the exploitation of a vulnerability related to `Collab.collectEmailInfo` to execute JavaScript. The extracted JavaScript files, `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_001.js`, are likely responsible for further stages of the attack, such as downloading and executing additional payloads.

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-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
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` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	431 bytes
`legacy_pdfkit_stage_000.js` `22eea48c9889ea8f369895266317fdc5c2b8f46a33b273e0de5b7f170704f820`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	11998 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `f963cc615a60f200d24d479c1670b228b60709d56bc01680cbaad9feee0e3ad2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4975 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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