Malicious PDF — malware analysis report

Static analysis result for SHA-256 176020b21688c2fe…

MALICIOUS

PDF

315.5 KB Created: 2010-08-18 18:54:46 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: 7463a0111b087c5823d5aa0786222960 SHA-1: 1fffaf883ba7400e8cc42300b28232a5dbf43e44 SHA-256: 176020b21688c2feb751ec4786b90036c946d4260148f1bb4be3d9585a4197d5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript, indicated by PDF_EMBEDDED_SCRIPT_PAYLOAD and EXTRACTED_FILE_STATIC_TRIAGE heuristics. The presence of PDF_EVAL and PDF_UNESCAPE calls suggests the script is obfuscated and designed to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. The embedded script likely serves to download and execute a second-stage payload, aligning with common malicious PDF attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 5

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Suspicious extracted artifact medium 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://michaelbolten.com/online-pharmacy-effexor-top.html
    • http://michaelbolten.com/aptos-ca-rite-aid-pharmacy-top.html
    • http://michaelbolten.com/canada-pharmacies-restasis-eye-drops-top.html
    • http://www.hollywoodbeachrealestate.org/percocet-online-pharmacy-top.html
    • http://www.blissentertainment.com.au/online-pharmacy-ultram-top.html
    • http://www.blissentertainment.com.au/Hoodia-Patch-Without-Prescription-top.html
    • http://www.hollywoodbeachrealestate.org/rx-america-pharmacy-help-desk-top.html
    • http://www.hollywoodbeachrealestate.org/order-valium-from-safe-online-pharmacy-top.html
    • http://michaelbolten.com/pharmacy-sample-drugs-top.html
    • http://www.hollywoodbeachrealestate.org/loestrin-fe-and-mail-order-pharmacy-top.html
    • http://www.blissentertainment.com.au/usa-online-pharmacies-that-sell-viagra-top.html
    • http://www.blissentertainment.com.au/%244-drugs-food-lion-pharmacy-list-top.html
    • http://michaelbolten.com/Buy-tadalafil-top.html
    • http://www.hollywoodbeachrealestate.org/pharmacy-tablet-identification-top.html
    • http://www.blissentertainment.com.au/no-prescription-drug-pharmacys-online-top.html
    • http://www.hollywoodbeachrealestate.org/Order-Crestor-top.html
    • http://www.hollywoodbeachrealestate.org/find-pharmacy-health-questions-and-answers-top.html
    • http://www.hollywoodbeachrealestate.org/understanding-health-insurance-pharmacy-tiers-top.html
    • http://www.blissentertainment.com.au/Micardis-Online-top.html
    • http://www.hollywoodbeachrealestate.org/u-s-medical-pharmacy-top.html
    • http://www.blissentertainment.com.au/online-pharmacies-that-have-didrex-cheap-top.html
    • http://michaelbolten.com/foreign-online-pharmacies-salazopyrin-top.html
    • http://www.blissentertainment.com.au/Cheap-Keflex-top.html
    • http://www.blissentertainment.com.au/american-pharmacies-that-carry-erfa-thyroid-top.html
    • http://michaelbolten.com/Cephalexin-For-Less-top.html
    • http://www.blissentertainment.com.au/Purchase-Combigan-top.html
    • http://www.hollywoodbeachrealestate.org/why-can%27t-my-pharmacy-get-midrin-top.html
    • http://michaelbolten.com/foreign-pharmacy-no-prescription-reviews-top.html
    • http://www.blissentertainment.com.au/us-pharmacy-zyrtec-zoloft-rxpricebusterscom-top.html
    • http://michaelbolten.com/usa-no-prescription-pharmacy-top.html
    • http://www.hollywoodbeachrealestate.org/medical-pharmacy-willimantic-ct-top.html
    • http://michaelbolten.com/Cheap-Exelon-top.html
    • http://www.hollywoodbeachrealestate.org/all-med-pharmacy-top.html
    • http://michaelbolten.com/aquazide-us-pharmacy-no-prescription-top.html
    • http://michaelbolten.com/tri-mix-gel-compounding-pharmacy-top.html
    • http://michaelbolten.com/progesterone-cream-pharmacy-wisconsin-price-top.html
    • http://michaelbolten.com/Temovate-Cream-Without-Prescription-top.html
    • http://www.blissentertainment.com.au/pharmacy-care-and-nutrition-top.html
    • http://www.blissentertainment.com.au/fox-army-health-center-pharmacy-formulary-top.html
    • http://www.hollywoodbeachrealestate.org/Lopid-Sale-top.html
    • http://www.blissentertainment.com.au/online-pharmacy-diet-pills-top.html
    • http://www.hollywoodbeachrealestate.org/foreign-pharmacies-ritalin-review-top.html
    • http://michaelbolten.com/pharmacy-reversible-prescription-vials-top.html
    • http://www.hollywoodbeachrealestate.org/no-prescription-german-pharmacy-prednisone-top.html
    • http://michaelbolten.com/offshore-pharmacies-vicodin-es-top.html
    • http://www.blissentertainment.com.au/phentermine-us-pharmacies-top.html
    • http://www.blissentertainment.com.au/pharmacy-prescription-assistance-nevada-top.html
    • http://michaelbolten.com/online-pharmacy-phendimetrazine-top.html
    • http://michaelbolten.com/Purchase-Lozol-top.html
    • http://www.hollywoodbeachrealestate.org/hormone-replacement-therapy-pharmacy-top.html
    +32 more URL(s)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000bde3.bin
a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBDE3 264072 bytes
embedded_pdf_script_0004ed56.bin
cef0bd7f6d77baffe3121d6e302c298cadea00c09ff5db85a5e93e78a884433c
pdf-embedded-script PDF decompressed stream script payload at offset 0x4ED56 323108 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 hex-escaped blob(s).