PDF malware analysis — malicious · 872879147e18cd14

MALICIOUS

PDF

7.4 KB Authoring application: Viraciregavi

MD5: 4d206246cb863a72e1999948caee65d0 SHA-1: 681fcd4e298cff338ca0e9c43f4fabf5bc993529 SHA-256: 872879147e18cd14f5540d6f39a9b698d91bb64e699bde7e5560fae8ca94f703

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscation. Critical heuristics identify specific CVEs (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) related to Acrobat API vulnerabilities, suggesting the script is designed to exploit these flaws. The presence of these exploits and the obfuscated JavaScript strongly suggests the execution of a second-stage payload. The document body text appears to be nonsensical filler, further supporting a malicious intent behind the document's structure.

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.Tool.HeapSprayHeuristic-6301967-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Tool.HeapSprayHeuristic-6301967-1
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_obj0009_000.js` `9c1af7b0bfb58cbe48f719b2b3313b6bb8d6d78ce125cae66b877b11f224dd71`	pdf-javascript-stream	PDF /JS object 9 at offset 0x565	5787 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 0x565	851 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).

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