PDF malware analysis — malicious · 31d0efdcb8d5bea3

MALICIOUS

PDF

3.0 KB

MD5: daca56ef77dbbe0bae8223345d3ac884 SHA-1: 1a1aad808c61564f41af5a068f522dc6260e2faf SHA-256: 31d0efdcb8d5bea3c6d4f58f0c41f7f9e12523bb3ff9952215fcf9faf73c1f32

398 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link or Document: Malicious Link T1204.002 Malicious Link or Document: Malicious Document

The PDF file contains embedded JavaScript that is triggered by the OpenAction. Multiple critical heuristics indicate exploitation of CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The embedded JavaScript is heavily obfuscated, but analysis indicates it is designed to download and execute a second-stage payload. The ClamAV detection of 'Pdf.Exploit.Agent-35646' further supports this. The exact nature of the payload cannot be determined from the provided evidence.

Heuristics 10

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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 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_obj0007_000.js` `1e17491e1170828f5464fbb91669c8fad855d85d182cb8ff250ca8f5c8bc2394`	pdf-javascript-stream	PDF /JS object 7 at offset 0xDB	34880 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` `019f1e680ff9b1c4f0289c29ff684393c8322eaa1c7b7ee6985026b13c6a4373`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0x112	7520 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 13 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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