PDF malware analysis — malicious · b2bb31ca8b43128b

MALICIOUS

PDF

12.2 KB

MD5: db1eaea7ef218eeb9e5eea92163b70c2 SHA-1: a729260f7aacdddb64cab147f60beeb685745dc2 SHA-256: b2bb31ca8b43128baa0d1bdde1efeffa19158093f7e449dcad5f49292a264ce3

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits CVE-2007-5659 using the Collab.collectEmailInfo method. This JavaScript is further obfuscated and split into multiple streams, with two deobfuscated JavaScript files extracted. The exploit likely serves as a dropper for a second-stage payload, indicated by the presence of these extracted JavaScript files and the ClamAV detection signature 'Pdf.Exploit.Agent-36062'.

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` `636edfd3b6afc7fdaf7600f48622be094753138a93c71f000b61ba573267ac6e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	11847 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `c7ea1fe954222faa6c3b215def9cbac8f2ad21c3211774af8d17ae21064c0ece`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	4855 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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