PDF malware analysis — malicious · 117c54cd4f7e7831

MALICIOUS

PDF

177.4 KB

MD5: 95f81c0f5d403aecdba1c61cd05c0a6c SHA-1: 908cde2699e4f1076b4a9ccf488c2fda2a79d7f7 SHA-256: 117c54cd4f7e7831dbe2777e85ddd90b32bcf192414d74305e4ee2b56ae73baa

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 leverages multiple CVEs (CVE-2007-5659, CVE-2009-4324) to execute code. The JavaScript is heavily obfuscated but appears to be designed to download and run a secondary payload, as indicated by the 'generic stage recovery' heuristics and the embedded SWF file. The ClamAV detection of 'Pdf.Exploit.Agent-35955' further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9713

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` `178018cb8a7a5e2c6c4ee6e6d6ef777b6766d83315773fb58538dafb6c0a9e0a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x13E	12119 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` `5e137e8a4b8f094dd90e3fb676d22a3072850231d8d99e3284ca7e971a90f25f`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 6 at offset 0x13E	12000 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` `cb59cc7eb17d9e31c2cd5bb184234d4216f2d5c36e79a73572f4d54861ec92af`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 6 at offset 0x13E	11466 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` `475132cad7effb785bc1cfcbbc0d7d19d62d6f226371b4b1c18fda177e785863`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 6 at offset 0x13E	7804 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` `17a3d1643ff2c391d55ef2ae40d1ceef4cabff47a00ead456cfb1134bf81f775`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-XX-to-%u from JavaScript object 6 at offset 0x13E	11347 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` `bbd54f5812430b84052596866b2179572cb26be8f863ef4a43028ed9c8f8ff61`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-XX-to-%u from JavaScript object 6 at offset 0x13E	7685 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`polyglot_child_pdf_off0002336a.pdf` `ee6ca3a5e7e1ec6dd3411eb344bc5036a8a7988f35a2622e8624ba7c18e888fc`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2336A	37418 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: unlikely

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