PDF malware analysis — malicious · 875bb054c86dee3f

MALICIOUS

PDF

2.2 KB

MD5: f7e8011d43f932207997bc5c07756aaa SHA-1: 247578b5bb1ecbf94d415ceb123d6e936b13bd07 SHA-256: 875bb054c86dee3fa1a50c412182e619065bc42ec7427e50e4335c810822fe24

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document contains embedded JavaScript that leverages known vulnerabilities (CVE-2009-0927 and CVE-2008-2992) via OpenAction and eval() calls. The embedded JavaScript is designed to be executed automatically upon opening the PDF. Analysis of the deobfuscated JavaScript indicates it likely downloads and executes a second-stage payload, as suggested by ClamAV detections of Pdf.Dropper.Agent-7279329-0 and Pdf.Exploit.Agent-35646 on the file and its extracted artifact.

Heuristics 9

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)
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.Dropper.Agent-7279329-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7279329-0
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.
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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_obj0009_000.js` `cd8c57879e62682ab7c88a957f7a8d12ac674fa198b597e4a5b45f226da4a893`	pdf-javascript-stream	PDF /JS object 9 at offset 0xBC	16044 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `64beaa5c29eed4e041e8cc372dc04f3fab718e3f98cb056dc56c5f97fc4d7649`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xE9	5812 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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