PDF malware analysis — malicious · 0b4c1365a94afffa

MALICIOUS

PDF

13.4 KB Authoring application: Toldihiqanopo

MD5: 2ae2b2d71b40e3e5612da656cd047215 SHA-1: f5261efaa6c7e6ba166d9f7890ae89fae16bca9a SHA-256: 0b4c1365a94afffa78e20fffed6e754059ab5bd48559e28d5c2fb9248ec04d4f

528 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains obfuscated JavaScript that exploits multiple known vulnerabilities in Adobe Reader (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). The deobfuscated JavaScript function `get_shellcode` constructs a URL by encoding the authoring application string 'Toldihiqanopo Nihempagaqilliz Vegemzixefanotilte Ubzg1QUbzuzgUbRjvcUb11RjUbzR1jUbzRzgUb1g14UbRT1:Ub1j1vUbRT1MUb14z:Ub1SRjUb1g1SUb1ARjUb141jUbRT1gUb1QzuUbvjzuUbzuzvUbvM1AUb1gzuUb:j11UbvuvRUbvuv4 Csrogeisojewaha Aaronitic abyssal will aboon knight wormwood. Acadie abelicea abashedly rosemary diane abacay fishers mara absterge. Abear abnormality desiree tarragon larry erenity ablepharia. Abey kermit shiva knight wormwood cookie abdiel. Collins abear abnormality desiree tarragon larry erenity ablepharia net socrates. Heather abuna criminal flowers extension. Scheme abuzz absorbability aaronitic abyssal. Abductor absenteeship aborted word abounding sensor heidi abolisher collins williamsburg susanne aboveproof. Scheme abuzz absorbability aaronitic abyssal will aboon knight abasement. Abacination able' using the provided encoding tables. This encoded string is then appended to a hardcoded string and executed, likely to download and run a secondary payload. The specific URL is not fully reconstructible due to truncation, but the encoding tables themselves are IOCs.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 11

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. (identified after JavaScript deobfuscation)
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)
Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH

A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
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.
ClamAV: Pdf.Exploit.Agent-36176 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36176
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.
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_obj0020_000.js` `681fb8346e2ca0f375d9beeba24e43a3b31939102901566b68fd3c4bfab16eb4`	pdf-javascript-stream	PDF /JS object 20 at offset 0x29CB	284103 bytes
Detection ClamAV: Pdf.Exploit.Agent-36176 Obfuscation or payload: unlikely
`page_word_xor_stage_000.js` `f79cb6396492fc3f84d20f988f26cb4025557f9420c0051b290e67aa8c54f506`	deobfuscated-js	page-word hex-tail XOR decoded JavaScript (decompressed, key=0x05) at offset 0x9E6	3215 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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