PDF malware analysis — malicious · b58baea0fa93eeaa

MALICIOUS

PDF

299.2 KB

MD5: bdf02e9673becbbb98234fdbd72002b9 SHA-1: 23d7d65d09527a2838561690a30711c62275ee01 SHA-256: b58baea0fa93eeaa98e840a3ffe5456c6cfd897c59f8cbf1c65b4427107291f0

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell T1204.002 Malicious File

The sample is a PDF file detected by ClamAV as Pdf.Exploit.Agent-36307. Static analysis identified multiple critical heuristic firings related to known PDF exploits (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992), all leveraging embedded JavaScript. An extracted JavaScript file, legacy_pdfkit_stage_000.js, was also detected by ClamAV as Js.Exploit.Shellcode-18. The embedded JavaScript is designed to exploit these vulnerabilities, likely to download and execute a second-stage payload.

Heuristics 8

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-36307 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36307
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `e3193a46f7693c04219cf5a6005aad6ba15f25d604ebd63116a5cdc693ed0aba`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3462 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `601039bd83ee1e31910e15d3127ab6e3f9f0554bdbc770233f6fbd0ef2378abf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xFA1	20141 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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