PDF malware analysis — malicious · 08b3c8619bb06c51

MALICIOUS

PDF

8.2 KB Authoring application: Kvojivedcoci (via Kelepiqomozmo)

MD5: e43f42b5401060223bfcd3f430f4eff9 SHA-1: 7c6fe90ba191319bab89e77326c2b2ed1972db04 SHA-256: 08b3c8619bb06c510a98e36ea94321a8e784fd2d7285dbe4ee576a1eb54c2d8c

468 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that triggers known Adobe Reader vulnerabilities (CVE-2007-5659 and CVE-2008-2992). The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 11

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)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-35649 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35649
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.
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)
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `08c066536a49e7616e3481dfb4bcc3f93a8da317f7dad4b59144124c3ddc5209`	pdf-javascript-stream	PDF /JS object 7 at offset 0x590	6309 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `4bb78f3d2ee13b44e1f050eb59686ac9662c13631c21878f63328610c8c73678`	deobfuscated-js	generic stage recovery split-literal-normalize from raw PDF metadata at offset 0x0	8123 bytes
Detection ClamAV: Pdf.Exploit.Agent-35649 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `77de430313ec490149d276a5247c92581c18a749dc47450ca346cd9db8dd5884`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 7 at offset 0x590	6027 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `dd9c8ba3f2f8daae431f152b1b686d8e4e06708b6739d7996828e6be96fef218`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x1322 at offset 0x1322	2600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_003.js` `b5a806c3389fc090594de6f575332f01000de1b87a27368efaf7682b67cdba1a`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from raw PDF metadata at offset 0x0	8119 bytes
Detection ClamAV: Pdf.Exploit.Agent-35649 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_004.js` `2a359b8f81e42acf5979d4ddf507be64c53cec965b17164b53e5ddeafbd3c604`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 7 at offset 0x590	6023 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `e962745d42533f84e7c64ef3f3e1c2eb6698c5bb7a2e7dd97bb2e4b2679ac163`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x590	284 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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