PDF malware analysis — malicious · 9839199678de6bbf

MALICIOUS

PDF

11.6 KB

MD5: e9aa977421e845253804f1b5450781a9 SHA-1: 31f7ccbc9d665eabbd37471f7c5345a0db5dc117 SHA-256: 9839199678de6bbf96f068eb1ba5a8a427fcf130cde6783acd1968987fd104c4

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF containing embedded JavaScript, identified by heuristics as exploiting CVE-2007-5659 via the Collab.collectEmailInfo method. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', are indicative of a multi-stage exploit. The primary function of the embedded scripts appears to be the deobfuscation and execution of further malicious code, likely leading to the download and execution of a second-stage payload. The ClamAV detection further supports its malicious nature.

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` `4252840a6d20a941283967f378a3b94138190cc0bb0cd47e93bab861568d7a01`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	11894 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `408d1cdba2e1b5262585339555ebd9b420979c74bb31d9c6b7509d1ae57c5f1a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4870 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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