PDF malware analysis — malicious · d8ad8638c5f53bad

MALICIOUS

PDF

12.0 KB

MD5: 086d2395fa7be99052470f7134312362 SHA-1: 5c410dfb79b864bcaf3ceaaaea5a9ef9a9e5a9b4 SHA-256: d8ad8638c5f53badf92f128afec098a94b97d956e215cfdc317ee827843766ae

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo function. This JavaScript is further deobfuscated into two separate files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. The primary function of this script appears to be downloading and executing a second-stage payload, as indicated by the critical heuristic firings and the nature of the extracted JavaScript.

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` `45dedb54ce351c14b884756dec1a8532c2c4aff57fba50d7dac07712bc6986f1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12151 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `5a924677e62748542601a89fba20a49cc7c17146e7522e9b475311fd7575e798`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5038 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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