PDF malware analysis — malicious · 62bbde65a2e9a1a7

MALICIOUS

PDF

274.5 KB

MD5: 5ff43b1e85a9b99f3c5a7fbb809d23db SHA-1: e9f7c79fc043523edf1311b4c6b3504c4e460364 SHA-256: 62bbde65a2e9a1a75364b92b4119fe874796e59d650dc60f7315a18971ed006e

596 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that exploits multiple Adobe Reader vulnerabilities, specifically CVE-2007-5659 and CVE-2009-4324, as indicated by the 'PDF_ADOBE_READER_MULTI_CVE_JS_KIT' heuristic. The JavaScript code appears to be designed to download and execute a secondary payload, as suggested by the 'generic stage recovery' findings and the presence of embedded SWF and JavaScript files. The ClamAV detection 'Pdf.Exploit.Agent-35955' further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 14

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. (matched in decompressed stream)
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)
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.
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`zVGWPnPsl.swf` `ae13437efad4e3a4f03cb0339d03b7d795966b217d30a540767c4ae26f402285`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x146D	26774 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `15689f302e582c730e2957af9f693527bed5d4b0c0400330afa9ba85ee307ff3`	pdf-javascript-stream	PDF /JS object 6 at offset 0x13C	12114 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`generic_stage_recovery_000.js` `67a1664ec3a59592a7fbfd661e759aff76914775713524b73c5f45be3a1be073`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 6 at offset 0x13C	11995 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`generic_stage_recovery_001.js` `cb1d2ccadd76a58cfe71bc22f7b8f3d5f650c42515f9c85c05f2f9ad257f9c57`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 6 at offset 0x13C	11461 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `1162e8f2f7367d453d389fa6529f5821f6b2e8f33f65fc82963e0dc116a9fea5`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 6 at offset 0x13C	7783 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`generic_stage_recovery_003.js` `7c7261ba17e4f02bfc97701d412ec6e6eba6fca17261ab4a3b164c30b226aa07`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-XX-to-%u from JavaScript object 6 at offset 0x13C	11342 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`generic_stage_recovery_004.js` `8607be2bfbfb443eb107e790cc13f6020d6574426a7d50e920b9365e383dab3a`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-XX-to-%u from JavaScript object 6 at offset 0x13C	7664 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`polyglot_child_pdf_off0003b7c4.pdf` `1a6680d1fc92463ff3785c6d92ec8a5a6b1798722e1986bd89fadc1455661f33`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x3B7C4	37419 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: unlikely

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