PDF malware analysis — malicious · cb8584d4c2adfe7a

MALICIOUS

PDF

7.5 KB Authoring application: Viraciregavi

MD5: 46edff87fa435a3e2098345e569d2fe9 SHA-1: f365993d5ec3fdf6e8abbe33c7e2266232dd5dad SHA-256: cb8584d4c2adfe7ae0faf67bc36105a10909e950367cdb7753ed0ae4e723b421

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF file contains embedded JavaScript that utilizes multiple known exploits (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) by calling Acrobat API functions like Collab.getIcon, Collab.collectEmailInfo, and util.printf. The JavaScript is obfuscated using eval() and unescape() functions, indicating an attempt to hide malicious code. The primary intent appears to be the execution of a second-stage payload, as suggested by the exploit triggers and the presence of deobfuscated JavaScript artifacts. The document body text is nonsensical and likely a distraction or filler.

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)
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-35649 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35649
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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` `8a64ed0d56ad4aa401d2462a6ccac8cf652315a4e04fa68c53479039b559450d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x45A	5790 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `1e0c8ca4c6180400afd62497a161d41969b04e1091a2d4ffa9764c7f00cf51a1`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x45A	851 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).

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