PDF malware analysis — malicious · 91e5c66cd3f0c1de

MALICIOUS

PDF

44.4 KB

MD5: ec9a31844017681a7af2a1e418483b5b SHA-1: b65a88c8c72499aa93ae1867abb31542ab3769b5 SHA-256: 91e5c66cd3f0c1dece01124950a0b6759f83aee73dcec507668e0bd74e4550b8

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript and exploits the CVE-2007-5659 vulnerability via the 'collab.collectEmailInfo' function. The extracted JavaScript artifacts, particularly 'deobfuscated.js', indicate a complex stager designed to download and execute further payloads. The presence of U3D content also suggests an exploit attempt. The primary attack vector appears to be leveraging a known PDF vulnerability to achieve arbitrary code execution.

Heuristics 7

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `a8a3139060a7bbdb4ba2fbd1602e72310b37673566e4abe31a2a25d5b4b5e17a`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4301	489 bytes
`annotation_subject_callee_hex_stage_000.js` `8cb9cd7ae89b0210afba77d26a0075ccd862d11de3ffc6c0190555cff703e522`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1AAA	5328 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `3c87b5b9d7129a2a52b62c614e438f3af345de093da2007dfe2611dca0c69a5b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AFE	12083 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `f03d5cbd41418ac2f362d51d314d157c9bc59e60b079914af75427258ae17df0`	deobfuscated-js	PDF JavaScript deobfuscation pass	309936 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004534.bin` `a96e1fca2499edf504d3934052ca1fc338d4b4898a65e6a361937ed1ba0dc0fe`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4534	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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